Definition: the pressure exerted by a single component of a mixture of gases, commonly expressed in mmHg or torr; for a gas dissolved in a liquid, the partial pressure is that of a gas that would be in equilibrium with the dissolved gas. Formerly, symbolized by p, followed by the chemical symbol in capital letters (pCO2, pO2); now, in respiratory physiology, P, followed by subscripts denoting location and/or chemical species (Pco2, Po2, Paco2.
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