Question

Reducing the volume of a gas_____ it's pressure if the_____ of the gas and the number of particles are constant

Answer 1

pressure and volume are proportional and can best be explained using boyles law, which is: \(\sf \color{blue}{P_1V_1=P_2V_2}\)
This says that the initial pressure and volume, is equal to the change in pressure, P\(_2\) and volume V\(_2\)

You can plug in random numbers to help you see the relationship, OR make a graph: