Question

what is the need of Kelvin Scale of temperature?

Answer 1

The way I see it, Kelvin is an absolute scale, while Celsius isn't.

Celsius uses 0 as the freezing point of water, whereas Kelvin uses 0 as the absolute absence of heat.

Answer 2

The kelvin is the primary unit of temperature measurement in the physical sciences, but is often used in conjunction with the degree Celsius, which has the same magnitude. Kelvin is an absolute scale, while Celsius is not.
therefore Kelvin Scale of temperature is needed.