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\begin{document}

Actual question given on a University of Washington chemistry midterm:

\begin{center}
\large\bfseries
	Is Hell exothermic (gives off heat) or endothermic (absorbs
	heat)? Support your answer with a proof.
\end{center}

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:

\begin{enumerateshort}
\item
	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.
\item
	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.
\end{enumerateshort}

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 that area, then (2) cannot be true, and so Hell
is exothermic.''

The student got the only 'A'.

\end{document}

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