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Although it isn't always accurate - especially at high pressures - the ideal gas law is a good, simple way of looking at the general relationship between pressure, volume, temperature and total number of particles in a gas.

According to the Ideal Gas Law:

PV = nRT

where

P is pressure, V is volume, n is the number of particles, R is the ideal gas constant , and T is absolute temperature.

If the system is closed, then by definition the number of particles remains the same even if volume changes. If the system is NOT closed, then the question is not sufficiently constrained to predict what will happen to the number of particles.

Assuming a closed system, if the volume increases then either the pressure must decrease or the temperature increase (or both).

If pressure is held constant, the temperature must increase to keep the pressure stable.

If the pressure is allowed to fall, the temperature may actually remain the same.

If the process is adiabatic, both the pressure and the temperature will decrease (for most gases - hydrogen and helium have a range where they actually heat up as they expand)

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7y ago
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7y ago

Assuming the pressure remains constant, the temperature will increase as the volume increases, and the number of particles will remain the same unless you add or remove some gas.

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Q: What happens to temperature and number particles as the volume increases?
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