### Definition

Gas Laws: temperature/pressure changes

PV=NRT

where k is the Boltzmann constant.

N is the number of molecules.

These equations are exact only for an ideal gas, which neglects various intermolecular effects.However, the ideal gas law is a good approximation for most gases under moderate pressure and temperature.

This law has the following important consequences:

- If temperature and pressure are kept constant, then the volume of the gas is directly proportional to the number of molecules of gas.
- If the temperature and volume remain constant, then the pressure of the gas changes is directly proportional to the number of molecules of gas present.
- If the number of gas molecules and the temperature remain constant, then the pressure is inversely proportional to the volume.
- If the temperature changes and the number of gas molecules are kept constant, then either pressure or volume (or both) will change in direct proportion to the temperature.

### Subspecialty

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### Keyword history

23%/2009