Gas compression

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I have a meter cubed volume of gas, what formulae do I need to calculate the space required for the gas when compressed at a variable psi/bar.

Not important at this time, but how would I allow for different densities of gas?

Many thanks.

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If you just want pressure and you have volume, you can use Boyle's Law, which states$p_1*v_1=p_2*v_2$. In other words, if you know the volume $v_1$ and pressure $p_1$ at one time, you can solve for $v_2$ if you know $p_2$ and vice versa. You can also use the Ideal Gas Law, $PV=nRT$.