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Title: Why do we use partial pressure for gas in blood and not molarity? Post by: CooperS on Dec 7, 2013 Hi,
When we are talking about gases in blood, why can't we just use moles per liter for concentration? Why does everyone use partial pressure? Partial pressure doesn't even directly tell you the relative concentration of two gases, because solubility has to be taken into effect. Thanks Title: Re: Why do we use partial pressure for gas in blood and not molarity? Post by: richardrichard on Dec 7, 2013 Because 'gases dissolve, diffuse, and react according to their partial pressures, and not according to their concentrations in gas mixtures or liquids' (Wikipedia, sorry!). Interesting question, though!
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