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# Kelvin scale

The Kelvin scale is the most widely used absolute temperature scale in the scientific world.

It is defined and calibrated according to two points: absolute zero and the triple point of water.

• Absolute zero is the temperature at which the particles of a substance possess the lowest possible internal energy.
• The triple point of water is the point at which the three phases of water (i.e. solid, liquid and gas) exist in equilibrium.

The SI unit of the thermodynamic temperature scale is the kelvin ($\text{K}$).

The thermodynamic temperature and the Celsius temperature are related by:$$T (\text{K})=T(^{\circ}\text{C})+273.15$$$T (\text{K})$ is the temperature in kelvins and $T^{\circ}\text{C}$ is the temperature in degrees Celsius.

A temperature difference of one kelvin is equivalent in magnitude to a difference of one degree Celsius (i.e. $\vert1\text{ K}\vert=\vert1^{\circ}\text{C}\vert$).