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This primer provides an introduction to the subject of surfaces at the level of undergraduates and first year postgraduates. There are four chapters, the first concerns basic thermodynamic material used to understand the properties of surfaces including; surface tension, Gibbs absorption, surface pressure and surface phase equilibria, surfactants and micelles, wetting, detergency, and contact angle. The second chapter concentrates on gas absorption at solid surfaces and covers topics including absorption, Langmuir isotherms, heats of absorption, BET isotherms, physisorbtion, chemisorbtion,...