Dalton’s law of additive pressures states that the “pressure of a gas mixture is equal to the sum of the pressures each gas would exert if it existed alone at the mixture temperature and volume”.

Dalton's law of additive pressures: The pressure of a gas mixture is equal to the sum of the pressures each gas would exert if it existed alone at the mixture temperature and volume.

P_mix = P₁ + P₂ + P₃ + ............ + P_n = ∑_iP_i

Where P1, P2, P3 are partial pressure of each component at the same temperature and volume of the mixture.

Amagat's law of additive volumes: The volume of a gas mixture is equal to the sum of the volumes each gas would occupy if it existed alone at the mixture temperature and pressure.

V = V₁ + V₂ + V₃ + ............ + V_n = ∑_iV_i

Where V₁, V₂, V₃ are considered to be the partial volumes of components in the gaseous mixture.