  A comprehensive study of the problem of laminar film condensation with both a
gravitational type body force and a moving vapour concurrent and parallel to
the surface has been presented here. It demonstrates where both the body force
and vapour velocity are significant through a comprehensive numerical solution
obtained by a modified Keller box method. Important parameters governing
condensation and heat transfer of pure vapour are determined. A perturbation
analysis is applied in the leading edge and downstream regimes. The thin film
approximations for the both regimes are obtained and compared with exact
numerical solutions.
