The effects of mass transfer and physical properties upon the thinning and rupture of a draining plane parallel film are investigated. An equation is derived in which the thinning rate is a function of bulk properties, surface properties (surface tension, surface viscosities, and the variation of surface tension with surface concentration), intermolecular forces (London-van der Waals forces and electrostatic double layer forces), adsorption and surface diffusion coefficients, bubble size and film thickness. An estimation for the critical thickness at which a film rupture is carried out and the coalescence time is obtained by integration to the critical thickness. The coalescence time is predicted as a function of bulk and surface properties. London-van der Waals forces, adsorption and surface diffusion coefficients, and bubble size.