The first law of thermodynamics, also known as the law of energy conservation, states that energy cannot be created or destroyed, only converted from one form to another. Mathematically, this is expressed as:
ΔE = Q - W
The second law of thermodynamics states that the total entropy (a measure of disorder or randomness) of an isolated system always increases over time. This law explains the direction of spontaneous processes, such as heat transfer from a hotter body to a cooler body. thermodynamics cengel ppt