The second law of thermodynamics deals with conversion of heat into work and direction of
Correct answer: A. Flow of heat.
- A. Flow of heat.
- B. Applied force.
- C. Applied pressure.
- D. Flow of internal energy.
Explanation
The second law of thermodynamics is fundamentally about the direction of processes. It states that heat flows spontaneously from a hotter to a cooler body and not in the opposite direction, which is why Option A (flow of heat) is correct. This law is crucial in understanding why certain processes occur naturally and why they require input to occur in reverse. Options B, C, and D are incorrect as they refer to concepts that are not central to the second law. Applied force and applied pressure (Options B and C) are related to mechanical aspects rather than thermodynamic directionality. The flow of internal energy (Option D), while a thermodynamic concept, is not the core focus of the second law, which is concerned with the direction of heat flow.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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