Final answer:
When pressure increases in a gas system, molar volume decreases due to Boyle's Law.
Explanation:
When the pressure increases in a gas system, molar volume decreases due to the inverse relationship between pressure and volume, as described by Boyle's Law.
For example, doubling the pressure on a gas at constant temperature will result in halving the volume it occupies, showcasing the inverse proportionality.
Therefore, as pressure increases, the gas particles are pushed closer together, occupying less space, leading to a decrease in molar volume.
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