kelvin scale definition

Introduction :
The Kelvin Scale or the absolute scale of temperature – Lord Kelvin devised a scale of temperature which is independent of the thermal property of the working substance. This scale is called Kelvin or absolute scale of temperature. The zero of this scale is the temperature at which the molecular motion ceases and average kinetic energy of molecules becomes zero. This temperature is called absolute zero. It is the lowest attainable temperature. No temperature can be less than this temperature. The temperature on this scale is represented by T and the unit is K i.e. Kelvin.

Relation between Celsius and Kelvin Scale

The size of 1 degree on Kelvin scale is the same as the size of 1 degree on Celsius scae i.e., the difference or change in temperature is the same on both the scales. The ice point 0 degree on the absolute scale is 273K and the steam point 100 degree Celsius is 373K. The absolute zero on this scale is thus corresponds to -273 degree Celsius.

Any temperature t degrees on the Celsius scale is equal to (273 + t) on the Kelvin scale.
And, since 100 Centigrade degrees (ice point is marked as 0 degrees and the steam point is marked as 100 degrees).= 180 Fahrenheit degrees

The relation between Fahrenheit and Kelvin scale is given by the formula,
Kelvin = [(°F-32) / (1.8)] + 273.15

Advantages of using kelvin scale

• If we keep the volume of a sample of gas constant, the pressure of the gas goes up in proportion to the Kelvin temperature. This is automatically holds good for an ideal gas; this is quite fortunate enough that many gases have almost  depict identical behavior, except at very low temperatures. 

•  For standard thermometers, we can change from ordinary mercury thermometers, which are convenient, to a gas thermometer. 

Thus a Kelvin scale is much more beneficial as compared to a Fahrenheit or Celsius scale