Discussion
Which pressure change accompanies a rise in temperature at constant volume?
Answer: C
With density fixed, the gas law gives pressure proportional to absolute temperature, which is Gay-Lussac's law. Doubling the absolute temperature therefore doubles the pressure. The atmosphere rarely holds volume constant, so this case arises more often in laboratory and engineering contexts than in meteorology, but the relation is part of the same single equation of state. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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