The total pressure p is described by Dalton's Law of Partial Pressures:
2.
Through expansion upon the definition of vapor pressure in the law of partial pressures as presented above and the definition of mixing ratio:
3.
In chemistry, it has been known since Dalton's law of partial pressures ( 1803 ), a measurement of mass is not even necessary to measure the amount of substance ( although in practice it is usual ).
4.
Dalton's Law of Partial Pressures assumes that the gases in the mixture are non-interacting ( with each other ) and each gas independently applies its own "'pressure "', the sum of which is the total pressure.
5.
In the two or three years following the reading of these essays, Dalton published several papers on similar topics, that on the absorption of gases by water and other liquids ( 1803 ), containing his law of partial pressures now known as Dalton's law.
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