Zeroth law of Thermodynamics Equation (Easily explained)

Zeroth law of Thermodynamics Equation

The equation of Zeroth law of thermodynamics is mentioned below:

“If Ta = Tc and Tb = Tc, then according to zeroth law of thermodynamics Ta = Tb. Where Ta, Tb and Tc are the temperatures of body A, B and C respectively.”

Explanation

Consider three blocks A, B and C at different temperatures.

Place these blocks such that block A and block B are not in contact with each other.

zeroth law of thermodynamics

Block A is in contact with block C, and in the same way block B is also in contact with block C.

After sometime, block A will be in thermal equilibrium with block C and similarly block B will also be in thermal equilibrium with block C. 

Now if we keep block A and block B in contact with each other, then there won’t be any heat transfer between them.

thermal equilibrium

In other words, block A and block B are also in thermal equilibrium now.

This phenomenon is represented using the mathematical formula given below;

If Ta = Tc and Tb = Tc, then according to zeroth law of thermodynamics Ta = Tb. Where Ta, Tb and Tc are the temperatures of body A, B and C respectively.

I hope now you have understood the Zeroth law of thermodynamics equation.

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