Heat And Thermodynamics By Brijlal And Subramanyam Pdf Patched May 2026
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3. First Law of Thermodynamics
- Statement: Energy cannot be created or destroyed, only transformed from one form to another.
- Mathematical Expression: ΔU = Q - W, where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system.
10. Applications
- Refrigerators and Heat Pumps: Devices that transfer heat from a colder body to a hotter body, requiring work input.
3. First Law of Thermodynamics
- Statement: The first law of thermodynamics, also known as the law of energy conservation, states that energy cannot be created or destroyed in an isolated system. It can only be transformed from one form to another.
- Mathematical Expression: ∆U = Q - W. This equation signifies that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system.