Amagat's law or the
Law of Partial Volumes of 1880 describes the behaviour and properties of mixtures of
ideal (as well as some cases of non-ideal) gases. Of use in
chemistry and
thermodynamics, Amagat's law states that the extensive volume
V = N·v of a gas mixture is equal to the sum of volumes
Vi of the
K component gases, if the temperature
T and the pressure
p remain the same:
This is the experimental expression of
volume as an
extensive quantity. It is named after
Emile Amagat.