Astronomy   View all facts   Glossary   Help
abstraction > mathematical concept > unit > temperature unit
Next unittime unit    Upunit    Previous unitsolid angle unit   

temperature unit comparison table
Subject convert to Kelvin has boiling point of water convert to Celsiu is a kind of has acronym is an acronym for is an instance of has proposal date has approval date has synonym has unit has base unit has approval agency has definition has proposition date has triple point of water has symbol convert to Fahrenheit is named after has absolute zero
Celsiusadd 273.15100   Syteme Internationalenamed derived SI unit  Centigradedefined in terms of derived SI unit via a system of quantity equationsK A mercury-in-glass temperature scale. The zero of the scale represents the melting point of ice and the boiling point of water is taken to be 100 degrees.17100.01°C Anders Celsius (1701-1744)-273.15
Curie temperature scale      temperature unit  magnetic temperature   This is sometimes used for indicating temperature in the vicinity of absolute zero. It is based on Curie's law, which states that the susceptibility of a paramagnetic material is approximately proportional to its absolute temperature. -has source: Jerrard, H.G., McNeill, D.B. 1992 Dictionary of Scientific Units, Chapman and Hall   -has source: Jerrard, H.G., McNeill, D.B. 1992 Dictionary of Scientific Units, Chapman and Hall
Fahrenheit      temperature unit1710     A temperature scale based on three fixed temperature points - the temperature of an ice and salt mixture, the freezing point of water and normal human temperature - which were taken to be 0, 32 and 96 respectively. It is mere coincidence that the temperature interval between the freezing (32 °F) and boiling (212 °F) points of water is 180° when expressed in the Fahrenheit scale. 32.018  G. D. Fahrenheit (1686-1736)-459.67
helium temperature scale      temperature unit 1958    The vapour pressure of helium 4 is used as an indication of temperature in the region 1 to 5.2 K. -has source: Jerrard, H.G., McNeill, D.B. 1992 Dictionary of Scientific Units, Chapman and Hall   -has source: Jerrard, H.G., McNeill, D.B. 1992 Dictionary of Scientific Units, Chapman and Hall
International temperature scale   temperature unitITS90  1927     A temperature scale defined between 0.65 K and the highest temperatures practicably measurable in terms of the Planck radiation law using monochromatic radiation. There are 17 fixed temperature points :
  • Below 5 K are defined in terms of the vapour pressures of helium 3 and helium 4
  • Between 5 K and the triple point of water are marked by the triple points of certain elements, e.g. neon (24.5561 K)
  • Above 0.01 °C are defined with reference to the freezing points of specified metallic elements
  • Upper limit is 1064.43 °C (1337.58 K), the freezing point of gold
[JN92] -has source: J. A. Hall, 1967
 -has source: Jerrard, H.G., McNeill, D.B. 1992 Dictionary of Scientific Units, Chapman and Hall   -has source: Jerrard, H.G., McNeill, D.B. 1992 Dictionary of Scientific Units, Chapman and Hall
Kelvin  subtract 273.15  Syteme Internationalebase SI unit 1968absolute  16th CGPMUnit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water 273.16K Lord Kelvin (1824-1907)0
Rankine      temperature unit      Unit which is 5/9 of the Kelvin. Rankine temperatures have the same temperature interval as those on the Fahrenheit scale. 491.688 subtract 459.69W. J. M. Rankine (1820-1872)0
Reaumur 80    temperature unit1730     An arbitrary scale in which the freezing and boiling points of water are taken to be 0 and 80°R respectively. The scale is based on the thermal expansion of an alcohol and water mixture. If the 'length' is 1000 units at the ice point the length expands to 1080 units at the boiling point, hence the peculiar figure of 80 in this scale. 0  R. A. F. Reaumur (1683-1757)-218.52

Next unittime unit    Upunit    Previous unitsolid angle unit