P1 + P2 +P3 + … + Pn = Pt The total pressure of a gas system is the sum of all the individual partial pressures of the different gas components in the system Watch the following video on partial pressure  and Dalton’s Law http://www.youtube.com/watch?v=w2UXUwNGAeY V1 + V2 + V3 + … + Vn = […]