Materials: at least three different locations and surfaces, some in sun additional containers of water clock or stopwatch graduated cylinder masking tape Pan Evaporation student record sheets (on following pages) thermometers three identical shallow pans for each team, (baking pans, etc., they may be metal, glass, or plastic) waterproof markers Procedure: Begin a discussion with your students about ways to determine how fast water evaporates: What observations might you need to make?