Question

If the temperature of a container of gas remains constant, how could the pressure of the gas increase?

Answer 1

By constraining the volume.

Explanation:

To a first approximation, `P=(nRT)/V`; if `T` is constant, `P` varies inversely with volume. And of course we could constrain the gas in a piston, which we could compress, thus decreasing `V` and increasing `P`.