1. Thermal Energy

2. Principle of Heat Exchange When heat is transferred from one body to another, the amount of heat lost by the hot body equals the amount of heat gained by the cold body.

3. Principle of Heat Exchange When heat is transferred from one body to another, the amount of heat lost by the hot body equals the amount of heat gained by the cold body.
Heat Lost
Heat Gained

4. Red & Blue: 0. 80 kg of red hot water at 90°C is allowed to mix with 0
Red & Blue: kg of red hot water at 90°C is allowed to mix with 0.70 kg of cold blue water at 5°C. a) What will happen when the divider is removed? b) What is the final temperature of the mixture?
Demo: convection – hot/cold water tank

5. (Assume two significant digits.)
A 200-g piece of iron was heated and was submerged in 150 g of water at 20°C to be cooled quickly. The final temperature of the iron and the water is _____°C. Determine the initial temperature of the iron.
(Assume two significant digits.)
Demo: hot iron mass in water

6. Calorimetry the careful and precise measurement of heat transfer
1 cal = J