If you heat a container filled with gas, what will happen?
a) you will slow the movement of molecules
b) the gas will escape
c) you will decrease the internal pressure
d) you will increase the internal pressure

If you heat a container filled with gas, you will increase the internal pressure.

The heat energy that you add to the gas gets spread around and increases
the average kinetic energy of all the gas molecules.  We perceive all of those
averagely increased molecular kinetic energies as increased pressure.
(Because the pressure of the gas is the result of all those tiny gas molecules
zipping around and hitting the inside of the container.) 

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