Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[Q]: Question: Pressure is defined as the force per unit area on? Answer: surface
[A]: Pressure is defined as the force per unit area on a surface.

[Q]: Question: When volume does not change, temperature is proportional to what other property? Answer: pressure
[A]: Pressure and temperature at constant volume are directly proportional.

[Q]: Question: Boiling points increase with which kind of mass? Answer: molar mass
[A]:
Carboxylic acids have high boiling points compared to other substances of comparable molar mass. Boiling points increase with molar mass.