The laws of thermodynamics are:
1).Zeroth law of thermodynamics:
According to zeroth law of thermodynamics if a body A is a thermal equilibrium with body c & body B is also in thermal equilibrium with body C than body A and body B are also in thermal equilibrium.
2).first law of thermodynamics:
for a closed system undergoing a cycle net heat transfer is equal to net work transfer.
3).second law of thermodynamics:
it is impossible to develop a cyclic device which produce work by exchanging heat with a single reservoir.
it is impossible to develop a cyclic device which transfer heat from lower temperature to higher temperature without any energy input.
4).Third law of thermodynamics:
its states that when a system is at zero absolute temperature ,the entropy of the system is zero.