Question

What are the two laws of thermodynamics?

Answer 1

1. First Law of Thermodynamics: First law of thermodynamics, also known as the law of conservation of energy, states that energy can neither be created nor destroyed, but it can be changed from one form to another.
$∆\mathrm{U}=\mathrm{q}-\mathrm{W}$
Where,
$∆\mathrm{U}$ = Change in internal energy of the system.
$\mathrm{q}$ = Algebraic sum of heat transfer between system and surroundings.
$\mathrm{W}$ = Work done by the system on the surrounding.

2. Second Law of Thermodynamics: Second law of thermodynamics states that the entropy in an isolated system always increases. Any isolated system spontaneously evolves towards thermal equilibrium—the state of maximum entropy of the system.
$∆\mathrm{S}>0$
Where, $∆\mathrm{S}$ = change in entropy