Discussion
Which process does an isobaric change describe?
Answer: D
Isobaric means at constant pressure, isochoric at constant volume, isothermal at constant temperature and adiabatic without heat exchange. Cooling to the dew point is an isobaric process, while a rising parcel undergoes an approximately adiabatic one. Keeping the four prefixes straight is essential because each corresponds to a different form of the first law. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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