ISO 31-4
In today's world, ISO 31-4 is a topic of great relevance and interest to a wide spectrum of society. Whether it's a current topic, a prominent figure, a historical event, or any other area of importance, ISO 31-4 has captured the attention of people of all ages and backgrounds. This attention is due, in part, to the relevance that ISO 31-4 has in people's daily lives, as well as its impact in different areas, such as politics, culture, technology or the economy. This article seeks to further explore the meaning and importance of ISO 31-4, as well as provide a detailed analysis of its impact on today's society.
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ISO 31-4 is the part of international standard ISO 31 that defines names and symbols for quantities and units related to heat. It is superseded by ISO 80000-5.
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.
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