Interfacial phenomena can have a major effect on high temperature processes; these are reviewed and examples given. Interfacial phenomena have been divided into the following categories (i) Marangoni flows, (ii) Wetting, (iii) Emulsions, (iv) Foams, and (v) Jets and surface waves. Examples and case histories are given for each of the above categories. (C) 2005 Springer Science + Business Media, Inc.