Dalton's law

Summary of Dalton's law
Dalton’s law states that the partial pressure of a gas in a mixture is the pressure that gas would exert if it occupied the total volume of the mixture. This law explains that the sum of all partial pressures of gas in a mixture should equal the barometric pressure. It is an especially important calculation for oxygen to determine the pressure of gas pushing into the alveoli and thus into the circulating blood. 

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Dalton's law

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According to Dalton’s law, the partial pressure of oxygen (increases/decreases) at high altitudes.