The gases are mixable with each other in all proportions. Since the ideal gas law
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(1) |
Let's think that we mix the volumes
,
, ...,
of different gases having an equal pressure
and an equal temperature
. If one measures the volume
of the mixture in the same pressure and temperature, one notices that
Each of the gases satisfies an equation
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(2) |
for each gas; here the pressure
Accordingly we have obtained the
Dalton's law. The pressure of a gas mixture is equal to the sum of the partial pressures of the component gases.
This law was invented by J. Dalton in 1801.
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