Heat transfer and doing work are the two everyday ways of moving energy into or out of a system. How does the source distinguish these two processes from each other?
AWork is an organized process; heat transfer is driven by temperature difference
BHeat transfer is an organized process; work is driven by temperature difference
CBoth are identical processes that always occur together
DWork always increases temperature; heat transfer never does
Answer & Solution
Correct answer: A. Work is an organized process; heat transfer is driven by temperature difference
1. The source separates the two energy-transfer methods by how organized each one is.
2. Work is described as a quite organized process, involving a macroscopic force exerted through a distance.
3. Heat transfer is described as a less organized process, driven instead by temperature differences.
4. This rules out option B, which swaps the two descriptions, and option C, since the source treats them as genuinely different processes.
5. Both heat and work can raise temperature, so option D's claim that only work can do so is false; the source specifically notes both can produce the same temperature change.
_Source: OpenStax College Physics (CC BY 4.0), Ch 15 "Thermodynamics", section 15.1 The First Law of Thermodynamics_
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