| May | JUN | Jul |
| 13 | ||
| 2012 | 2013 | 2014 |
|
|
This article does not cite any references or sources. (December 2009) |
ISO 31-4 is the part of international standard ISO 31 that defines names and symbols for quantities and units related to heat.
Its definitions include:
| Quantity | Unit | Remarks | |||
|---|---|---|---|---|---|
| Name | Symbol | Name | Symbol | Definition | |
| thermodynamic temperature | T, (Θ) | kelvin | K | The kelvin is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water. | For practical measurements, the International Temperature Scale of 1990 defines several fixed points and interpolation procedures. |
| Celsius temperature | t, φ | degree Celsius | °C | The degree Celsius is a special name for the unit kelvin, for use in stating values of Celsius temperature. | t = T − T0, where T0 = 273.15 K |
| linear expansion coefficient | αl | reciprocal kelvin, kelvin to the power negative 1 | K−1 |  |
|
| ... | |||||
Annex A of ISO 31-4 lists units of heat based on the foot, pound and second and some other units, including the degree Rankine, degree Fahrenheit, British thermal unit and others. Annex B lists conversion factors for three versions of the calorie.
 |
This physics-related article is a stub. You can help Wikipedia by expanding it.
|
 |
This standards- or measurement-related article is a stub. You can help Wikipedia by expanding it.
|
