Question

what is zeroth law of thermodynamics

Answer 1

zeroth law of thermodynamics day's that two system in thermal equilibrium with third system separately are in thermal equilibrium with each other. hope this answer will help you

Answer 2

Hi

Here is your answer,

→This law was formulated by RH Fowler in 1931. The zeroth law of thermodynamics stated that

→If two system A and B are separately in thermal equilibrium with a third system C, then A and B are in thermal equilibrium with each other.

→Now, Let us consider two system A and B separated by a fixed adiabatic wall. The two system A and B are in contact with a third system C through diathermic wall. The macroscopic variables A and B will vary until both A and B comes in thermal equilibrium with the third system C.

→Now , this indicates that the two system A and B are separately in thermal equilibrium with a third system C. 

→Now, let the adiabatic wall between A and B is replaced by a diathermic wall and an adiabatic wall insulates C from A and B. A and B are found in thermal equilibrium with each other. This condition is shown in the below figure.