 Partial pressure

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 $p$.

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.