“The contact angle is defined as the angle the water makes with the surface. In this illustration, a low contact angle (θ<90 ̊) means the surface is hydrophilic. Large contact angles (θ>90 ̊) lead to a surface that is hydrophobic.” (Reference, PEG/PPG PDF) Or, more simply, “The angle where a liquid or vapour interacts with a solid surface”. (Reference) This is important as it can determine if something is hydrophilic and water loving or hydrophobic and water hating.
The home of SwiftCraftyMonkey Formulating Inc.! Join Susan as she obsesses about cosmetic chemistry and other things (some possibly related to monkeys). Often strange, occasionally useful, and always worth a stop as a point of interest on your journey through the Intertron.
