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A pump compresses gas very fast, so no heat escapes. The process is:
AAdiabatic, with $Q = 0$ for the gas during compression
BIsothermal, since the gas stays at room temperature
CIsobaric, since pressure is conserved at the pump
DIsochoric, since volume cannot change during the stroke
Answer & Solution
Correct answer: A. Adiabatic, with $Q = 0$ for the gas during compression
No heat exchange means adiabatic: $Q = 0$.
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