This lecture covers the principles of condensation, focusing on forced and natural convection, boiling, and condensation processes. It explains the factors influencing fluid motion, such as phase transition, surface tension, density difference, and latent heat. The lecture also delves into laminar film condensation on vertical plates, discussing mass conservation, momentum, and energy conservation. Correlations for calculating convection coefficients in different condensation scenarios are presented, including film condensation on radial systems. Various examples and calculations are provided to illustrate the application of these correlations.