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 |
Celsius | add 273.15 | 100 | | | | Syteme Internationale | named derived SI unit | | | Centigrade | defined in terms of derived SI unit via a system of quantity equations | K | | 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. | 1710 | 0.01 | °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 unit | 1710 | | | | | | 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 unit | ITS90 | | | 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 Internationale | base SI unit | | 1968 | absolute | | | 16th CGPM | Unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water | | 273.16 | K | | 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 459.69 | W. J. M. Rankine (1820-1872) | 0 |
Reaumur | | 80 | | | | | temperature unit | 1730 | | | | | | 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 |