Kelvin Scale of Temperature

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Lord Kelvin (1824-1907) devised this scale of temperature. Hence, this is called the Kelvin scale, and in this scale, temperature is expressed in Kelvin. In SI system, Kelvin is the unit of temperature. In this scale of temperature, zero of the scale corresponds to -273⁰C, which is said to be the temperature at which the volume of a gas reduces to zero. Hence, -273⁰C is also known as the absolute zero. For the same reason, this scale of temperature is also known as absolute scale of temperature. On this scale, the lower fixed point i.e. the temperature of melting ice at normal pressure is +273K and the upper fixed point ie,. the temperature of boiling water at normal pressure is 373K. The magnitude of each Kelvin is same as the magnitude of 1⁰C.

If TK represents a temperature on Kelvin scale and t⁰C represents the same temperature on Celsius scale, then (TK = t⁰C +273 or t⁰C = TK- 273)

Example:

1) Express 37⁰C in Kelvin Scale

TK = t⁰C+273 = 37 + 273

T = 310 K

2) Express 543 K in Celsius scale

t⁰C = TK-273

= 543 - 273

t = 270⁰C