Mix two parts of one temperature with one part at another temperature. Pedict what the final temperature will be, then do it. How good was your prediction this time? Derive a formula for the final temperature when mixing two different amounts of water (of different temperatures) together?

Do you think equal volumes of clay and water have equal heat content? Devise an experiment to find out.

Devise a way to test different insulation materials and how well they prevent heat from flowing from one object to another. For example, look at different kinds of hot beverage containers and how long they keep things hot.