Question

What does it mean to say that two systems are in thermal equilibrium?

a) They have the same temperature.
b) They have the same pressure.
c) They have the same volume.
d) They have the same internal energy.

Answer 1

Thermal equilibrium means two systems are at the same temperature and there is no net transfer of heat between them.

Step-by-step explanation:

Thermal equilibrium refers to two systems being at the same temperature. When two objects in contact with each other are at the same temperature, they are said to be in thermal equilibrium. This means that there is no net transfer of heat between the two systems.