Temperature like any other physical quantity is basically defined as the measure of the warmth or the coldness of a substance or object with reference to some standard value. While it is used to express hot and cold conditions, the temperature is usually measured with a thermometer which is marked in several temperature scales mainly Celsius and Fahrenheit. There are also various other units of temperature, and we will look at them below.
SI Unit of Temperature
The SI unit of temperature as per the International System of Units is Kelvin which is represented by the symbol K. The Kelvin scale is widely accepted or used in the field of science and engineering. However, in most parts of the world, Celsius or Fahrenheit scale is used for measuring temperature.
In any case, here is the relation between Celsius Fahrenheit and Kelvin:
Temperature Conversion
Celsius, Fahrenheit and Kelvin are the three common temperature scales. Each of the scales has its uses, so it is likely that you will encounter them and would require you to convert between them. In the table below, we have listed the conversion formula.
| From | To Fahrenheit | To Celsius | To Kelvin |
| Fahrenheit (°F) | \(\begin{array}{l}^{\circ}F\end{array} \) |
\(\begin{array}{l}\frac{5}{9}\times (^{\circ}F-32)\end{array} \) |
\(\begin{array}{l}^{\circ}F-32\times\times \frac{5}{9}+273.15\end{array} \) |
| Celsius (°C) | \(\begin{array}{l}(^{\circ}C\times \frac{9}{5})+32\end{array} \) |
\(\begin{array}{l}(^{\circ}C)\end{array} \) |
\(\begin{array}{l}^{\circ}C+273.15\end{array} \) |
| Kelvin (K) | \(\begin{array}{l}(K-273.15)\times \frac{9}{5}+32\end{array} \) |
\(\begin{array}{l}K-273.15\end{array} \) |
\(\begin{array}{l}K\end{array} \) |
Other Temperature Units
Some other common temperature units are Rankine, Newton, Rømer, Réaumur, and Delisle.
| Conversion of Units | ||
| Units | From Celsius | To Celsius |
| Kelvin | [K] = [°C] + 273.15 | [°C] = [K] − 273.15 |
| Fahrenheit | [°F] = [°C] × 9 ⁄ 5 + 32 | [°C] = ([°F] − 32) × 5 ⁄ 9 |
| Rankine | [°R] = ([°C] + 273.15) × 9 ⁄5 | [°C] = ([°R] − 491.67) × 5 ⁄ 9 |
| Newton | [°N] = [°C] × 33 ⁄ 100 | [°C] = [°N] × 100 ⁄ 33 |
| Rømer | [°Rø] = [°C] × 21⁄40 + 7.5 | [°C] = ([°Rø] − 7.5) × 40 ⁄ 21 |
| Réaumur | [°Ré] = [°C] × 4 ⁄ 5 | [°C] = [°Ré] × 5 ⁄ 4 |
| Delisle | [°De] = (100 − [°C]) × 3 ⁄ 2 | [°C] = 100 − [°De] × 2 ⁄ 3 |
Related articles:
| Unit Of Weight | Unit Of Work |
Frequently Asked Questions – FAQs
What is the SI unit of temperature?
What is heat transfer by conduction?
Define heat.
Define temperature.
What is convection and radiation?
Radiation: It is the method in which the transfer of heat takes place by electromagnetic waves.
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