Partial pressure ( $p_{i}$ )

The partial pressure of a component of a gas mixture is the pressure it would exert alone at the same temperature and total volume. For an ideal mixture,

p_{i} = n_{i} RT / V

and

p = \sum_{i} p_{i}

. The chemical potential of an ideal gas uses

p_{i}

for that component rather than the total pressure

p

.

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Partial pressure refers to the pressure exerted by a single component of a mixture of gases. In a mixture, each gas contributes to the total pressure based on its amount and temperature, and the partial pressure of a component is essentially the pressure that gas would exert if it occupied the entire volume of the mixture by itself at the same temperature.

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