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A change in volume will also directly affect the pressure of a system. A decrease in volume will lead to a higher pressure and an increase in volume will lead to lower pressure. Thinking of the equation PV=nRT is helpful since it shows how pressure and volume are inversely proportional.
If you decrease the volume, pressure will increase. You can think of this logically; if you have a certain amount of material that takes up a certain amount of space, and you try to squish it into a smaller space, the pressure will increase.
One trick I like to use is to look at the relationship between the variables of the PV=nRT equation. because P and V are on the same side of the equation that means they have an inverse relationship. This means an increase in one leads to a decrease in the other and vice versa.
Pressure and volume are inversely related. An increase in volume decreases pressure and decrease in volume increases pressure, so think of them this way when approaching equilibrium shifts. The side with more moles of gas will shift to the other reactionary side with an increase in pressure or decrease in volume. The opposite happens with the opposite conditions.
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