### Theory:

Objective:

In this exercise we will learn the method to convert the Celsius to Kelvin and vice versa.

Celsius and Kelvin:

The Kelvin and Celsius are the SI units used to measure the temperature of objects.

We use the symbol C to represent the Celsius, similarly we use K for Kelvin.

Remember that $0\mathrm{°}\phantom{\rule{0.147em}{0ex}}C\phantom{\rule{0.147em}{0ex}}=273.16\phantom{\rule{0.147em}{0ex}}K$. But generally we use $0\mathrm{°}\phantom{\rule{0.147em}{0ex}}C\phantom{\rule{0.147em}{0ex}}=273\phantom{\rule{0.147em}{0ex}}K$.

Relation between the Celsius and Kelvin:
The below formula explain the relation between the Celsius and Kelvin.

${T}_{\left(K\right)}={T}_{\left(C\right)}+273$.

Here T denotes the temperature, K denotes the Kelvin and C denotes Celsius of a matter.
Now we learn how convert the temperatures Celsius to Kelvin and vice versa.

Celsius to Kelvin:
To convert the temperature on the Celsius scale to the Kelvin scale we have to add 273 from the given temperature.

${T}_{\left(K\right)}={T}_{\left(C\right)}+273$.
Example:
If the temperature of water is $5\phantom{\rule{0.147em}{0ex}}\mathrm{°}C$, then convert it to Kelvin.

To change the water temperature Celsius to Kelvin add 273 with the water temperature.

$\begin{array}{l}{T}_{\left(K\right)}={T}_{\left(C\right)}+273\\ \\ {T}_{\left(K\right)}=5+273\\ \\ {T}_{\left(K\right)}=278 K\end{array}$

Kelvin to Celsius
To convert the temperature on Kelvin scale to the Celsius scale we have to Subtract 273 from the given temperature.

${T}_{\left(C\right)}={T}_{\left(K\right)}-273$
Example:
If the temperature of a room is $286\phantom{\rule{0.147em}{0ex}}K$, then convert it to Celsius.

To convert the temperature on Kelvin scale to the Celsius scale we have to subtract 273 from the given temperature.
$\begin{array}{l}{T}_{\left(C\right)}={T}_{\left(K\right)}-273\\ \\ {T}_{\left(C\right)}=286-273\\ \\ {T}_{\left(C\right)}=13\phantom{\rule{0.147em}{0ex}}\mathrm{°}C\end{array}$
Absolute Zero:
The temperature at which there is no motion and no heat remains in the substance and all the particles will freeze their motion.

Absolute zero is the lowest temperature possible. Absolute zero occurs at a temperature of 0 Kelvin, or -273.15 $\mathrm{°}\phantom{\rule{0.147em}{0ex}}C$.
Important!
The minimum value of Kelvin is 0, Kelvin scale cannot be negative. Because at the zero Kelvin the particles in the substances are will freeze their motion. Therefore kelvin scale is impossible to be negative.
Did you know?

The SI units of temperatures Celsius and Kelvin are named after the scientists names Anders Celsius and William Thomson, 1st Baron Kelvin.