"Is Hell exothermic (gives off heat) or endothermic (absorbs heat)?
Support your answer with a proof."

Most of the students wrote proofs of their beliefs using Boyle's Law
(gas cools off when it expands and heats up when it is compressed) or
some variant.

One student, however, wrote the following:

First, we need to know how the mass of Hell is changing in time. So, we

need to know the rate that souls are moving into Hell and the rate they
are leaving. I think that we can safely assume that once a soul gets to
Hell, it will not leave. Therefore, no souls are leaving. As for how
many souls are entering Hell, let's look at the different religions that

exist in the world today. Some of these religions state that if you are
not a member of their religion, you will go to Hell. Since there are
more than one of these religions and since people do not belong to
more than one religion, we can project that all people and all souls go
to Hell.
With birth and death rates as they are, we can expect the number of
souls in Hell to increase exponentially. Now, we look at the rate of
change of the volume in Hell because Boyle's Law states that in order
for the temperature and pressure in Hell to stay the same, the volume of

Hell has to expand as souls are added.

This gives two possibilities.

#1 If Hell is expanding at a slower rate than the rate at which souls
enter Hell, then the temperature and pressure in Hell will increase
until all Hell breaks loose.

#2 Of course, if Hell is expanding at a rate faster than the increase
of souls in Hell, then the temperature and pressure will drop until Hell

freezes over.

So which is it? If we accept the postulate given to me by Ms. Therese
Banyan during my Freshman year, "That it will be a cold night in Hell
before I sleep with you," and take into account the fact that I still
have not succeeded in having sexual relations with her, then #2
cannot be true, and so Hell is exothermic.

The student got the only A grade.