Dalton's Law of partial pressure states that the pressure of a
mixture of gases is the sum of its partial pressures.
P is the total pressure.
Pi is the partial pressure of constituent gas i.
N is the total number of gas species in the mixture.
In a mixture of gases, the partial pressure of a specific component gas
is the pressure it would have exerted had it been alone in the container.
Dalton's law is applicable when the gases are considered to be ideal.
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