Dalton's Law of Partial Pressures

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Dalton's law of partial pressures states that the total pressure of a mixture of gases (the last tank in the picture) is equal to the sum of partial pressures exerted by each component gas (the first two tanks). This represents the limit of ideal behavior. Deviations can occur at higher pressures.

Contributed by: Enrique Zeleny (December 2011)
Open content licensed under CC BY-NC-SA


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The units used for pressure are atmospheres (atm). The gases can be oxygen and nitrogen, the major components of air, for example.



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