text:
Beam me up, Scotty
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For other uses, see Beam me up (disambiguation).
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Beam me up, Scotty
Character
James T. Kirk
Actor
William Shatner
First used in
Star Trek, though not verbatim
"Beam me up, Scotty" is a catchphrase that made its way into popular culture from the science fiction television series Star Trek. It comes from the command Captain Kirk gives his chief engineer, Montgomery "Scotty" Scott, when he needs to be transported back to the Starship Enterprise.
Though it has become irrevocably associated with the series and films, the exact phrase was never actually spoken in any Star Trek television episode or film.
Despite this, the quote has become a phrase of its own over time. It can be used to describe one's desire to be elsewhere, technology such as teleportation, slang for certain drugs, or as a phrase to show appreciation and association with the television show.
Contents
[hide]
1 Precise quotations
2 Legacy
3 See also
4 References
5 Further reading
Precise quotations[edit]
Despite the phrase entering into popular culture, it is a misquotation and has never been said in any of the television series or films.[1] There have, however, been several "near misses" of phrasing. In the Original Series episodes "The Gamesters of Triskelion" and "The Savage Curtain", Kirk said, "Scotty, beam us up"; while in the episode "This Side of Paradise," Kirk simply said, "Beam me up". The animated episodes "The Lorelei Signal" and "The Infinite Vulcan" used the phrasing "Beam us up, Scotty". The original film series has the wording "Scotty, beam me up" in Star Trek IV: The Voyage Home and "Beam them out of there, Scotty" in Star Trek Generations. The complete phrase was eventually said by William Shatner in the audio adaptation of his novel Star Trek: The Ashes of Eden.[citation needed][2]
James Doohan, the actor who played Scotty, later chose this phrase as the title of his autobiography.[3]
Legacy[edit]
The popularity of the misquotation has led to many new phrases, both associated with Star Trek or otherwise.
The misquotation's influence led to James Doohan, the actor who played Scotty, to be misrepresented in his own obituary. In it, he is referenced as the character who "responded to the command, "Beam me up, Scotty", despite having never responded to this exact command in the show[4].
The quote "Beam me up, Scotty!" has been extended beyond its original meaning to describe an expression of "the desire to be elsewhere"[5], or the desire to be out of an unwanted situation. Along with this, it has been associated with things that are futuristic, such as the possibility of teleportation[6][7].
The phrase has also been used as slang for certain drugs. An Oxford Reference page defined "Beam me up, Scotty" as "a mixture of phencyclidine and cocaine" and to "talk to Scotty, high off Scotty, see Scotty... etc."[8][9].
In recent usage, the phrase has been referenced by Baxter County Sheriff's drug slang defnitions[10]. It is also referenced in the book "Vice Slang" by Tom Dalzell and Terry Victor, for crack cocaine, and to describe "Beamers, Beemers", as those taking said drugs[11].
The exact timing of when the phrase became popular is unclear. However, early signs of the quote's usage to describe something separate of Star Trek can be found roughly ten years after Star Trek's airing in 1966, in a publication of the Royal Aeronautical Journal. It describes a certain routine as "a sort of 'beam me up scotty' routine'"[12]. Over time, the phrase has been extended to, "Beam me up, Scotty, there's no intelligent life down here!", popularized on bumper stickers and t-shirts, despite neither quote ever being said on the show[13][14].
See also[edit]
Misquotations
James Traficant, a U.S. Congressman from Ohio who used the catchphrase during his service (1985–2002) in the U.S. House of Representatives from 1997 to 2002.
Beam me up Scotty (mixtape)
Beam Me Up, Scotty (D.C. Scorpio song)
References[edit]
Jump up ^ "Beam Me Up Scotty". Sunday Mirror. April 1, 2007. Retrieved December 27, 2013. (subscription required)
Jump up ^ Beam Me Up, Scotty - TV Tropes
Jump up ^ Thomas, Bob (July 20, 2005). "'Star Trek's' Doohan dies, immortalized for 'Beam me up, Scotty'". Associated Press. Archived from the original on June 10, 2014. Retrieved December 27, 2013. (subscription required)
Jump up ^ http://www.legacy.com/ns/james-doohan-obituary/14596035
Jump up ^ https://greensdictofslang.com/search/basic?q=beam+me+up+scotty
Jump up ^ https://www.npr.org/2017/07/14/537174817/scientists-teleport-a-photon-into-space
Jump up ^ https://www.sciencedaily.com/releases/2016/09/160921082605.htm
Jump up ^ http://www.oxfordreference.com/view/10.1093/acref/9780199829941.001.0001/acref-9780199829941-e-2583?rskey=lsCDby&result=3
Jump up ^ https://greensdictofslang.com/search/basic?q=beam+me+up+scotty
Jump up ^ https://www.baxtercountysheriff.com/plugins/show_image.php?id=917
Jump up ^ https://www.e-reading.club/bookreader.php/134109/Dalzell%2C_Victor_-_Vice_Slang.pdf
Jump up ^ https://books.google.ca/books?redir_esc=y&id=w0dWAAAAMAAJ&dq=%22Beam+me+up+Scotty%22&focus=searchwithinvolume&q=%22Beam+me+up+Scotty%22
Jump up ^ https://www.amazon.com/BEAM-SCOTTY-Theres-Intelligent-Life/dp/B00NCCAV5W
Jump up ^ http://www.feelingoodtees.com/BEAM-ME-UP-SCOTTY-THERES-NO-INTELLIGENT-LIFE-DOWN-HERE-T-SHIRTWHITE-INK-P2821.aspx
Further reading[edit]
Michael Quinion (August 6, 1996). "BEAM ME UP, SCOTTY!". World Wide Words.
Barbara Mikkelson (July 18, 2007). "Beam Me Up, Scotty!". Snopes.com.
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Easter Bunny
From Wikipedia, the free encyclopedia
Jump to: navigation, search
Easter Bunny
A 1907 postcard featuring the Easter Bunny
Grouping
Legendary creature
Sub grouping
Animal
Mythology
Folkloric figure and symbol of Easter
Other name(s)
Easter Rabbit, Easter Hare
Country
Germany
Habitat
Grass
The Easter Bunny (also called the Easter Rabbit or Easter Hare) is a folkloric figure and symbol of Easter, depicted as a rabbit bringing Easter eggs. Originating among German Lutherans, the "Easter Hare" originally played the role of a judge, evaluating whether children were good or disobedient in behavior at the start of the season of Eastertide.[1] The Easter Bunny is sometimes depicted with clothes. In legend, the creature carries colored eggs in his basket, candy, and sometimes also toys to the homes of children, and as such shows similarities to Santa Claus or the Christkind, as they both bring gifts to children on the night before their respective holidays. The custom was first[2][unreliable source?] mentioned in Georg Franck von Franckenau's De ovis paschalibus[3] ('About Easter Eggs') in 1682, referring to a German tradition of an Easter Hare bringing Easter eggs for the children.
Contents
[hide]
1 Symbols
1.1 Rabbits and hares
1.2 Eggs
2 Association with Ēostre
2.1 Transformed bird
3 See also
4 References
5 External links
Symbols
Rabbits and hares
The hare was a popular motif in medieval church art. In ancient times, it was widely believed (as by Pliny, Plutarch, Philostratus, and Aelian) that the hare was a hermaphrodite.[4][5][6] The idea that a hare could reproduce without loss of virginity led to an association with the Virgin Mary, with hares sometimes occurring in illuminated manuscripts and Northern European paintings of the Virgin and Christ Child. It may also have been associated with the Holy Trinity, as in the three hares motif.[4][7] Eggs, like rabbits and hares, are fertility symbols[8] of antiquity. Since birds lay eggs and rabbits and hares give birth to large litters in the early spring, these became symbols of the rising fertility of the earth at the Vernal Equinox.
Rabbits and hares are both prolific breeders. Female hares can conceive a second litter of offspring while still pregnant with the first.[9][10] This phenomenon is known as superfetation. Lagomorphs mature sexually at an early age and can give birth to several litters a year (hence the saying, "to breed like rabbits" or "to breed like bunnies"). It is therefore not surprising that rabbits and hares should become fertility symbols, or that their springtime mating antics should enter into Easter folklore.
Eggs
Main articles: Easter egg and Egg decorating
In addition, Orthodox churches have a custom of abstaining from eggs during the fast of Lent. The only way to keep them from being wasted was to boil or roast them, and begin eating them to break the fast.[citation needed] As a special dish, they would probably have been decorated as part of the celebrations. Later, German Protestants retained the custom of eating colored eggs for Easter, though they did not continue the tradition of fasting.[11] Eggs boiled with some flowers change their color, bringing the spring into the homes, and some over time added the custom of decorating the eggs.[12] Many Christians of the Eastern Orthodox Church to this day typically dye their Easter eggs red,[13] the color of blood, in recognition of the blood of the sacrificed Christ (and, of the renewal of life in springtime). Some also use the color green, in honor of the new foliage emerging after the long-dead time of winter. The Ukrainian art of decorating eggs for Easter, known as pysanky, dates to ancient, pre-Christian times. Similar variants of this form of artwork are seen amongst other eastern and central European cultures.[14]
The idea of an egg-giving hare went to the U.S. in the 18th century. Protestant German immigrants in the Pennsylvania Dutch area told their children about the "Osterhase" (sometimes spelled "Oschter Haws"[15]). Hase means "hare", not rabbit, and in Northwest European folklore the "Easter Bunny" indeed is a hare. According to the legend, only good children received gifts of colored eggs in the nests that they made in their caps and bonnets before Easter.[16]
Dreihasenfenster (Window of Three Hares) in Paderborn Cathedral in Paderborn, Germany
Marshmallow bunnies and candy eggs in an Easter basket
A bunny and decorated Easter eggs
A chocolate Easter Bunny
Chocolate Easter Bunny molds from Alsace Musée du pain d'épices
Association with Ēostre
In his 1835 Deutsche Mythologie, Jacob Grimm states "The Easter Hare is unintelligible to me, but probably the hare was the sacred animal of Ostara". This proposed association was repeated by other authors including Charles Isaac Elton [17] and Charles J Billson.[18] In 1961 Christina Hole wrote, "The hare was the sacred beast of Eastre (or Eostre), a Saxon goddess of Spring and of the dawn."[19] The belief that Ēostre had a hare companion who became the Easter Bunny was popularized when it was presented as fact in the BBC documentary Shadow of the Hare (1993).[20]
The Oxford Dictionary of English Folklore however states "... there is no shred of evidence" that hares were sacred to Ēostre, noting that Bede does not associate her with any animal.[21]
Transformed bird
Sarah Ben Breathnach in Mrs Sharp's Traditions (1990) provides an origin story for the Easter Bunny: "According to legend, Eostre's favorite animal was a large handsome bird, which in a fit of anger she turned into a hare."[22] Another version of this story, in which Ēostre transforms the bird into a hare in an act of mercy, was written by Jean-Andrew Dickmann and appeared in Cricket magazine.[23] Both Breathnach and Dickmann present their respective 'transformed bird' stories as if they were legend, though no earlier version of either has been attested.
See also
Domestic and pet rabbits
Easter Bilby
Ēostre
Mad as a March hare
Osterfuchs[de] (Easter Fox) (in German)
Rabbits in the arts
Rabbits in culture and literature
The Goose That Laid the Golden Eggs
References
Jump up ^ Cross, Gary (2004). Wondrous Innocence and Modern American Children's Culture. Oxford University Press. ISBN 0195348133.
Jump up ^ Easter Bunny - What Does He Have To Do With Easter?, occultcenter.com
Jump up ^ Franck von Franckenau, Georg (1682). Disputatione ordinaria disquirens de ovis paschalibus / von Oster-Eyern. Satyrae Medicae. XVIII. Heidelberg. p. 6. Retrieved 18 July 2013.
^ Jump up to: a b Chapman, Chris (2004). "What does the Symbol Mean?". Three Hares Project. Retrieved 20 April 2014.
Jump up ^ Marta Powell Harley. "Rosalind, the hare, and the hyena in Shakespeare's As You Like It". Shakespeare Quarterly.
Jump up ^ "Sir Thomas Browne (1646; 6th ed., 1672) Pseudodoxia Epidemica III:xvii (pp. 162-166)".
Jump up ^ "Three Hares as representation of the Trinity". Threehares.blogspot.com. 2006-02-25. Retrieved 2010-06-29.
Jump up ^ Heller, Steven (April 2014). "Seeing Rabbits". Academic Search Complete (Vol. 68 Issue 2). |access-date= requires |url= (help)
Jump up ^ Martinez-Gomez, Margarita (September 2004). "Overlapping litters and reproductive performance in the domestic rabbit". Academic Search Complete (Vol. 82 Issue 4). Physiology & Behavior. |access-date= requires |url= (help)
Jump up ^ Lumpkin, Susan; John Seidensticker (2011). Rabbits: The Animal Answer Guide. JHU Press. ISBN 0-8018-9789-0. p. 122.
Jump up ^ Shrove Tuesday Pancakes! by Bridget Haggerty - Irish Culture & Customs, World Cultures European, paragraph 5 line 2 refers to the Catholic custom of abstaining from eggs during Lent. Accessed 3/1/08
Jump up ^ Snodgrass, Lucie L. (March 2005). "DYED IN Tradition". Academic Search Complete (Issue 329). Vegetarian Times. |access-date= requires |url= (help)
Jump up ^ How To Dye Red Eggs with Onion Skins for Greek Easter by Nancy Gaifyllia from Your Guide to Greek Food on About.Com Accessed April 9, 2008
Jump up ^ Hallett, Vicky (March 31, 2003). "Egg-cellent art". Academic Search Complete (Vol. 134 Issue 10). U.S. News & World Report. |access-date= requires |url= (help)
Jump up ^ "Gruß vom Osterhasen: Oschter Haws Song : GERMAN WORLD MAGAZINE". Germanworldonline.com. 2011-04-23. Retrieved 2013-03-31.
Jump up ^ Easter Symbols Archived 2008-03-12 at the Wayback Machine. from Lutheran Hour Ministries. Accessed 2/28/08
Jump up ^ Charles Isaac Elton (1890), Origins of English History
Jump up ^ Charles J Billson (1892), Folk-Lore vol 3 issue 4
Jump up ^ Christina Hole (1961) Easter and its Customs
Jump up ^ Attenborough, Sir David (Presenter) (April 12, 1993). Wildlife on One Easter Special Shadow of the Hare (Television). United Kingdom: BBC.
Jump up ^ Jacqueline Simpson and Stephen Roud (2000), A Dictionary of English Folklore
Jump up ^ Sarah Ben Breathnach (1990), Mrs Sharp's Traditions: Reviving Victorian Family Celebrations of Comfort and Joy
Jump up ^ Jean-Andrew Dickmann (2002), The Coming of Eostre, Cricket magazine vol 29 issue 7
External links
Wikimedia Commons has media related to Easter Bunny.
Charles J. Billson. "The Easter Hare". Folk-Lore. Vol. 3, No. 4 (December 1892).
On the Bunny Trail: In Search of the Easter Bunny, Stephen Winick, Folklife Today, March 22, 2016
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Density
From Wikipedia, the free encyclopedia
Jump to: navigation, search
This article is about mass density. For other uses, see Density (disambiguation).
Density
Common symbols
ρ
D
SI unit
kg/m3
A graduated cylinder containing various coloured liquids with different densities.
The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume:[1]
ρ = m V {\displaystyle \rho ={\frac {m}{V}}}
where ρ is the density, m is the mass, and V is the volume. In some cases (for instance, in the United States oil and gas industry), density is loosely defined as its weight per unit volume,[2] although this is scientifically inaccurate – this quantity is more specifically called specific weight.
For a pure substance the density has the same numerical value as its mass concentration. Different materials usually have different densities, and density may be relevant to buoyancy, purity and packaging. Osmium and iridium are the densest known elements at standard conditions for temperature and pressure but certain chemical compounds may be denser.
To simplify comparisons of density across different systems of units, it is sometimes replaced by the dimensionless quantity "relative density" or "specific gravity", i.e. the ratio of the density of the material to that of a standard material, usually water. Thus a relative density less than one means that the substance floats in water.
The density of a material varies with temperature and pressure. This variation is typically small for solids and liquids but much greater for gases. Increasing the pressure on an object decreases the volume of the object and thus increases its density. Increasing the temperature of a substance (with a few exceptions) decreases its density by increasing its volume. In most materials, heating the bottom of a fluid results in convection of the heat from the bottom to the top, due to the decrease in the density of the heated fluid. This causes it to rise relative to more dense unheated material.
The reciprocal of the density of a substance is occasionally called its specific volume, a term sometimes used in thermodynamics. Density is an intensive property in that increasing the amount of a substance does not increase its density; rather it increases its mass.
Contents
[hide]
1 History
2 Measurement of density
2.1 Homogeneous materials
2.2 Heterogeneous materials
2.3 Non-compact materials
3 Changes of density
4 Density of solutions
5 Densities
5.1 Various materials
5.2 Others
5.3 Water
5.4 Air
5.5 Molar volumes of liquid and solid phase of elements
6 Common units
7 See also
8 References
9 External links
History
In a well-known but probably apocryphal tale, Archimedes was given the task of determining whether King Hiero's goldsmith was embezzling gold during the manufacture of a golden wreath dedicated to the gods and replacing it with another, cheaper alloy.[3] Archimedes knew that the irregularly shaped wreath could be crushed into a cube whose volume could be calculated easily and compared with the mass; but the king did not approve of this. Baffled, Archimedes is said to have taken an immersion bath and observed from the rise of the water upon entering that he could calculate the volume of the gold wreath through the displacement of the water. Upon this discovery, he leapt from his bath and ran naked through the streets shouting, "Eureka! Eureka!" (Εύρηκα! Greek "I have found it"). As a result, the term "eureka" entered common parlance and is used today to indicate a moment of enlightenment.
The story first appeared in written form in Vitruvius' books of architecture, two centuries after it supposedly took place.[4] Some scholars have doubted the accuracy of this tale, saying among other things that the method would have required precise measurements that would have been difficult to make at the time.[5][6]
From the equation for density (ρ = m/V), mass density has units of mass divided by volume. As there are many units of mass and volume covering many different magnitudes there are a large number of units for mass density in use. The SI unit of kilogram per cubic metre (kg/m3) and the cgs unit of gram per cubic centimetre (g/cm3) are probably the most commonly used units for density.1,000 kg/m3 equals 1 g/cm3. (The cubic centimeter can be alternately called a millilitre or a cc.) In industry, other larger or smaller units of mass and or volume are often more practical and US customary units may be used. See below for a list of some of the most common units of density.
Measurement of density
Homogeneous materials
The density at all points of a homogeneous object equals its total mass divided by its total volume. The mass is normally measured with a scale or balance; the volume may be measured directly (from the geometry of the object) or by the displacement of a fluid. To determine the density of a liquid or a gas, a hydrometer, a dasymeter or a Coriolis flow meter may be used, respectively. Similarly, hydrostatic weighing uses the displacement of water due to a submerged object to determine the density of the object.
Heterogeneous materials
If the body is not homogeneous, then its density varies between different regions of the object. In that case the density around any given location is determined by calculating the density of a small volume around that location. In the limit of an infinitesimal volume the density of an inhomogeneous object at a point becomes: ρ ( r → ) = d m / d V {\displaystyle \rho ({\vec {r}})=dm/dV} , where d V {\displaystyle dV} is an elementary volume at position r {\displaystyle r} . The mass of the body then can be expressed as
m = ∫ V ρ ( r → ) d V . {\displaystyle m=\int _{V}\rho ({\vec {r}})\,dV.}
Non-compact materials
In practice, bulk materials such as sugar, sand, or snow contain voids. Many materials exist in nature as flakes, pellets, or granules.
Voids are regions which contain something other than the considered material. Commonly the void is air, but it could also be vacuum, liquid, solid, or a different gas or gaseous mixture.
The bulk volume of a material—inclusive of the void fraction—is often obtained by a simple measurement (e.g. with a calibrated measuring cup) or geometrically from known dimensions.
Mass divided by bulk volume determines bulk density. This is not the same thing as volumetric mass density.
To determine volumetric mass density, one must first discount the volume of the void fraction. Sometimes this can be determined by geometrical reasoning. For the close-packing of equal spheres the non-void fraction can be at most about 74%. It can also be determined empirically. Some bulk materials, however, such as sand, have a variable void fraction which depends on how the material is agitated or poured. It might be loose or compact, with more or less air space depending on handling.
In practice, the void fraction is not necessarily air, or even gaseous. In the case of sand, it could be water, which can be advantageous for measurement as the void fraction for sand saturated in water—once any air bubbles are thoroughly driven out—is potentially more consistent than dry sand measured with an air void.
In the case of non-compact materials, one must also take care in determining the mass of the material sample. If the material is under pressure (commonly ambient air pressure at the earth's surface) the determination of mass from a measured sample weight might need to account for buoyancy effects due to the density of the void constituent, depending on how the measurement was conducted. In the case of dry sand, sand is so much denser than air that the buoyancy effect is commonly neglected (less than one part in one thousand).
Mass change upon displacing one void material with another while maintaining constant volume can be used to estimate the void fraction, if the difference in density of the two voids materials is reliably known.
Changes of density
Main articles: Compressibility and Thermal expansivity
In general, density can be changed by changing either the pressure or the temperature. Increasing the pressure always increases the density of a material. Increasing the temperature generally decreases the density, but there are notable exceptions to this generalization. For example, the density of water increases between its melting point at 0 °C and 4 °C; similar behavior is observed in silicon at low temperatures.
The effect of pressure and temperature on the densities of liquids and solids is small. The compressibility for a typical liquid or solid is 10−6 bar−1 (1 bar = 0.1 MPa) and a typical thermal expansivity is 10−5 K−1. This roughly translates into needing around ten thousand times atmospheric pressure to reduce the volume of a substance by one percent. (Although the pressures needed may be around a thousand times smaller for sandy soil and some clays.) A one percent expansion of volume typically requires a temperature increase on the order of thousands of degrees Celsius.
In contrast, the density of gases is strongly affected by pressure. The density of an ideal gas is
ρ = M P R T , {\displaystyle \rho ={\frac {MP}{RT}},}
where M is the molar mass, P is the pressure, R is the universal gas constant, and T is the absolute temperature. This means that the density of an ideal gas can be doubled by doubling the pressure, or by halving the absolute temperature.
In the case of volumic thermal expansion at constant pressure and small intervals of temperature the temperature dependence of density is :
ρ = ρ T 0 1 + α ⋅ Δ T {\displaystyle \rho ={\frac {\rho _{T_{0}}}{1+\alpha \cdot \Delta T}}}
where ρ T 0 {\displaystyle \rho _{T_{0}}} is the density at a reference temperature, α {\displaystyle \alpha } is the thermal expansion coefficient of the material at temperatures close to T 0 {\displaystyle T_{0}} .
Density of solutions
The density of a solution is the sum of mass (massic) concentrations of the components of that solution.
Mass (massic) concentration of each given component ρi in a solution sums to density of the solution.
ρ = ∑ i ϱ i {\displaystyle \rho =\sum _{i}\varrho _{i}\,}
Expressed as a function of the densities of pure components of the mixture and their volume participation, it allows the determination of excess molar volumes:
ρ = ∑ i ρ i V i V = ∑ i ρ i φ i = ∑ i ρ i V i ∑ i V i + ∑ i V E i {\displaystyle \rho =\sum _{i}\rho _{i}{\frac {V_{i}}{V}}\,=\sum _{i}\rho _{i}\varphi _{i}=\sum _{i}\rho _{i}{\frac {V_{i}}{\sum _{i}V_{i}+\sum _{i}{V^{E}}_{i}}}}
provided that there is no interaction between the components.
Knowing the relation between excess volumes and activity coefficients of the components, one can determine the activity coefficients.
V E ¯ i = R T ∂ ln  γ i ∂ P {\displaystyle {\overline {V^{E}}}_{i}=RT{\frac {\partial \ln \gamma _{i}}{\partial P}}}
Densities
Various materials
Further information: Orders of magnitude (density)
Densities of various materials covering a range of values
Material
ρ (kg/m3)[note 1]
Notes
Hydrogen 0.0898
Helium 0.179
Aerographite 0.2 [note 2][7][8]
Metallic microlattice 0.9 [note 2]
Aerogel 1.0 [note 2]
Air 1.2 At sea level
Tungsten hexafluoride 12.4 One of the heaviest known gases at standard conditions
Liquid hydrogen 70 At approx. −255 °C
Styrofoam 75 Approx.[9]
Cork 240 Approx.[9]
Pine 373 [10]
Lithium 535
Wood 700 Seasoned, typical[11][12]
Oak 710 [10]
Potassium 860 [13]
Ice 916.7 At temperature < 0 °C
Cooking oil 910...930
Sodium 970
Water (fresh) 1,000 At 4 °C, the temperature of its maximum density
Water (salt) 1,030 0.9%
Liquid oxygen 1,141 At approx. −219 °C
Nylon 1,150
Plastics 1,175 Approx.; for polypropylene and PETE/PVC
Tetrachloroethene 1,622
Magnesium 1,740
Beryllium 1,850
Glycerol 1,261 [14]
Concrete 2,400 [15][16]
Silicon 2,330
Aluminium 2,700
Diiodomethane 3,325 Liquid at room temperature
Diamond 3,500
Titanium 4,540
Selenium 4,800
Vanadium 6,100
Antimony 6,690
Zinc 7,000
Chromium 7,200
Tin 7,310
Manganese 7,325 Approx.
Iron 7,870
Niobium 8,570
Brass 8,600 [16]
Cadmium 8,650
Cobalt 8,900
Nickel 8,900
Copper 8,940
Bismuth 9,750
Molybdenum 10,220
Silver 10,500
Lead 11,340
Thorium 11,700
Rhodium 12,410
Mercury 13,546
Tantalum 16,600
Uranium 18,800
Tungsten 19,300
Gold 19,320
Plutonium 19,840
Rhenium 21,020
Platinum 21,450
Iridium 22,420
Osmium 22,570
Notes:
Jump up ^ Unless otherwise noted, all densities given are at standard conditions for temperature and pressure,
that is, 273.15 K (0.00 °C) and 100 kPa (0.987 atm).
^ Jump up to: a b c Air contained in material excluded when calculating density
Others
Entity
ρ (kg/m3)
Notes
Interstellar medium 6981099999999999999♠1×10−19 Assuming 90% H, 10% He; variable T
The Earth 5,515 Mean density.[17]
The inner core of the Earth 13,000 Approx., as listed in Earth.[18]
The core of the Sun 33,000–160,000 Approx.[19]
Super-massive black hole 7005900000000000000♠9×105 Density of a 4.5-million-solar-mass black hole
Event horizon radius is 13.5 million km.
White dwarf star 7009210000000000000♠2.1×109 Approx.[20]
Atomic nuclei 7017229999999999999♠2.3×1017 Does not depend strongly on size of nucleus[21]
Neutron star 7018100000000000000♠1×1018
Stellar-mass black hole 7018100000000000000♠1×1018 Density of a 4-solar-mass black hole
Event horizon radius is 12 km.
Water
See also: Water density
Density of liquid water at 1 atm pressure
Temp. (°C)[note 1]
Density (kg/m3)
−30 983.854
−20 993.547
−10 998.117
0 999.8395
4 999.9720
10 999.7026
15 999.1026
20 998.2071
22 997.7735
25 997.0479
30 995.6502
40 992.2
60 983.2
80 971.8
100 958.4
Notes:
Jump up ^ Values below 0 °C refer to supercooled water.
Air
Main article: Density of air
Air density vs. temperature
Density of air at 1 atm pressure
T (°C)
ρ (kg/m3)
−25 1.423
−20 1.395
−15 1.368
−10 1.342
−5 1.316
0 1.293
5 1.269
10 1.247
15 1.225
20 1.204
25 1.184
30 1.164
35 1.146
Molar volumes of liquid and solid phase of elements
Molar volumes of liquid and solid phase of elements
Common units
The SI unit for density is:
kilograms per cubic meter (kg/m3)
Litres and metric tons are not part of the SI, but are acceptable for use with it, leading to the following units:
kilograms per liter (kg/L)
grams per milliliter (g/mL)
metric tons per cubic meter (t/m3)
Densities using the following metric units all have exactly the same numerical value, one thousandth of the value in (kg/m3). Liquid water has a density of about 1 kg/dm3, making any of these SI units numerically convenient to use as most solids and liquids have densities between 0.1 and 20 kg/dm3.
kilograms per cubic decimetre (kg/dm3)
grams per cubic centimetre (g/cm3)
1 g/cm3 = 1000 kg/m3
megagrams (metric tons) per cubic metre (Mg/m3)
In US customary units density can be stated in:
Avoirdupois ounces per cubic inch (1 g/cc ≈ 0.578036672 oz/cu in)
Avoirdupois ounces per fluid ounce (1 g/cc ≈ 1.04317556 oz/fl. oz = 1.04317556 lbs/pint)
Avoirdupois pounds per cubic inch (1 g/cc ≈ 0.036127292 lb/cu in)
pounds per cubic foot (1 g/cc ≈ 62.427961 lb/cu ft)
pounds per cubic yard (1 g/cc ≈ 1685.5549 lb/cu yd)
pounds per US liquid gallon (1 g/cc ≈ 8.34540445 lb/gal)
pounds per US bushel (1 g/cc ≈ 77.6888513 lb/bu)
slugs per cubic foot
Imperial units differing from the above (as the Imperial gallon and bushel differ from the US units) in practice are rarely used, though found in older documents. The Imperial gallon was based on the concept that an Imperial fluid ounce of water would have a mass of one Avoirdupois ounce, and indeed 1 g/cc ≈ 1.00224129 ounces per Imperial fluid ounce = 10.0224129 lbs per Imperial gallon. The density of precious metals could conceivably be based on Troy ounces and pounds, a possible cause of confusion.
See also
List of elements by density
Air density
Area density
Bulk density
Buoyancy
Charge density
Density prediction by the Girolami method
Dord
Energy density
Lighter than air
Linear density
Number density
Orders of magnitude (density)
Orthobaric density
Paper density
Specific weight
Spice (oceanography)
Standard temperature and pressure
References
Jump up ^ The National Aeronautic and Atmospheric Administration's Glenn Research Center. "Gas Density Glenn research Center". grc.nasa.gov. Archived from the original on April 14, 2013.
Jump up ^ "Density definition in Oil Gas Glossary". Oilgasglossary.com. Archived from the original on August 5, 2010. Retrieved September 14, 2010.
Jump up ^ Archimedes, A Gold Thief and Buoyancy Archived August 27, 2007, at the Wayback Machine. – by Larry "Harris" Taylor, Ph.D.
Jump up ^ Vitruvius on Architecture, Book IX, paragraphs 9–12, translated into English and in the original Latin.
Jump up ^ "EXHIBIT: The First Eureka Moment". Science. 305 (5688): 1219e. 2004. doi:10.1126/science.305.5688.1219e.
Jump up ^ Fact or Fiction?: Archimedes Coined the Term "Eureka!" in the Bath, Scientific American, December 2006.
Jump up ^ New carbon nanotube struructure aerographite is lightest material champ Archived October 17, 2013, at the Wayback Machine.. Phys.org (July 13, 2012). Retrieved on July 14, 2012.
Jump up ^ Aerographit: Leichtestes Material der Welt entwickelt – SPIEGEL ONLINE Archived October 17, 2013, at the Wayback Machine.. Spiegel.de (July 11, 2012). Retrieved on July 14, 2012.
^ Jump up to: a b "Re: which is more bouyant [sic] styrofoam or cork". Madsci.org. Archived from the original on February 14, 2011. Retrieved September 14, 2010.
^ Jump up to: a b Raymond Serway; John Jewett (2005), Principles of Physics: A Calculus-Based Text, Cengage Learning, p. 467, ISBN 0-534-49143-X, archived from the original on May 17, 2016
Jump up ^ "Wood Densities". www.engineeringtoolbox.com. Archived from the original on October 20, 2012. Retrieved October 15, 2012.
Jump up ^ "Density of Wood". www.simetric.co.uk. Archived from the original on October 26, 2012. Retrieved October 15, 2012.
Jump up ^ CRC Press Handbook of tables for Applied Engineering Science, 2nd Edition, 1976, Table 1-59
Jump up ^ glycerol composition at Archived February 28, 2013, at the Wayback Machine.. Physics.nist.gov. Retrieved on July 14, 2012.
Jump up ^ [1]
^ Jump up to: a b Hugh D. Young; Roger A. Freedman. University Physics with Modern Physics Archived April 30, 2016, at the Wayback Machine.. Addison-Wesley; 2012. ISBN 978-0-321-69686-1. p. 374.
Jump up ^ Density of the Earth, wolframalpha.com, archived from the original on October 17, 2013
Jump up ^ Density of Earth's core, wolframalpha.com, archived from the original on October 17, 2013
Jump up ^ Density of the Sun's core, wolframalpha.com, archived from the original on October 17, 2013
Jump up ^ Extreme Stars: White Dwarfs & Neutron Stars Archived September 25, 2007, at the Wayback Machine., Jennifer Johnson, lecture notes, Astronomy 162, Ohio State University. Accessed: May 3, 2007.
Jump up ^ Nuclear Size and Density Archived July 6, 2009, at the Wayback Machine., HyperPhysics, Georgia State University. Accessed: June 26, 2009.
External links
"Density". Encyclopædia Britannica. 8 (11th ed.). 1911.
"Density". The New Student's Reference Work. 1914.
Video: Density Experiment with Oil and Alcohol
Video: Density Experiment with Whiskey and Water
Glass Density Calculation – Calculation of the density of glass at room temperature and of glass melts at 1000 – 1400°C
List of Elements of the Periodic Table – Sorted by Density
Calculation of saturated liquid densities for some components
Field density test
On-line calculator for densities and partial molar volumes of aqueous solutions of some common electrolytes and their mixtures, at temperatures up to 323.15 K.[permanent dead link]
Water – Density and specific weight
Temperature dependence of the density of water – Conversions of density units
A delicious density experiment
Water density calculator Water density for a given salinity and temperature.
Liquid density calculator Select a liquid from the list and calculate density as a function of temperature.
Gas density calculator Calculate density of a gas for as a function of temperature and pressure.
Densities of various materials.
Determination of Density of Solid, instructions for performing classroom experiment.
density prediction
density prediction
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Densitet – Swedish
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