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There is an interesting practical problem related to this. One can
find the amount of gasoline in a fuel tank (like in an airplane wing)
by dipping a hollow glass rod into the tank all the way to the bottom
and then cap the open end of the rod with a finger. When you pull the
rod out, you can see how much fuel is in the tank. The surprise is
that the air in the top of the tube only expands enough to let the
fuel drop a fraction of a millimeter - hardly affecting the reading.