" 68.A system is said to be in thermal equilibrium if "

Two systems are said to be in thermal equilibrium with each other, if they are at the same________.

A system is said to be in thermodynamic equilibrium when

When is a body said to be in thermal equilibrium?

A body is said to be in equilibrium

Mark the correct options: a) A system X is in thermal equilibrium with Y but not with Z. System Y and Z may be in thermal equilibrium with each other. b) A system X is in thermal equilibrium with Y but not with Z. Systems Y and Z are not in thermal equilibrium with each other. c) A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z must be in thermal equilibrium with each other. d) A system X is neither in thermal equilibrium with Y nor with Z. The system Y and Z may be in thermal equilibrium with each other.