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Unit of Temperature

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:

\(\begin{array}{l}^o C = \frac{(^oF-32)}{1.8}\end{array} \)

\(\begin{array}{l}\textup{Celsius to Kelvin:} \, K=\, ^oC + 273 \end{array} \)

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:

Frequently Asked Questions – FAQs

What is the 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.

What is heat transfer by conduction?

It is the method in which the transfer of heat takes place between atoms and molecules in direct contact.

Define heat.

Heat is defined as the total energy of an object that has molecular motion inside it. The SI unit of heat is Joule.

Define temperature.

Temperature is defined as the measure of the thermal energy of an object. The SI unit of temperature as per the International System of Units is Kelvin.

What is convection and radiation?

Convection: It is the method in which the transfer of heat happens by the movement of the heated substance.
Radiation: It is the method in which the transfer of heat takes place by electromagnetic waves.
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