What is the SI Unit of Temperature?

SI unit of Temperature is kelvin (K)

The SI unit for temperature is the kelvin (K), named after the Scottish physicist Lord Kelvin. Kelvin is one of the seven base units in the International System of Units (SI) and is used to express temperatures in the scientific and engineering communities. Temperature is a measure of the average kinetic energy of particles in a substance or system.

In the Kelvin scale, the size of one kelvin is the same as one degree Celsius, but the Kelvin scale does not use the degree symbol. The relationship between Kelvin (K) and Celsius (°C) is given by the equation:

K = °C + 273.15

The Kelvin scale is an absolute temperature scale, meaning it starts from absolute zero, the lowest possible temperature where particles have minimal motion. Absolute zero is defined as 0 Kelvin.