Question

an object in thermal equilibrium separately, with A and B then what is the temperature of both a and b​

Answer 1

Explanation:

Both A and B will also have same temperature or you can say they will be in thermal equilibrium too.

How this happens?.....

Did you heard about Zeroth law of thermodynamics?

It states that if two bodies are in thermal equilibrium with a separate body then that two bodies will also be in thermal equilibrium to each other.

Let say if temperature of Body A is T1 and temperature of body B is T2 and temperature of object is T3.

Then as said in question that object is in thermal equilibrium with A and B,

means… T1 = T3

and ... T2 = T3

Then by zeroth law of thermodynamics:-

T1 = T2

I hope it helps.....feel free to ask any doubt related to solution in comments.....