1. 2 types of Heat Energy Kinetic Energy – is energy in motion. Temperature is the average KE of molecules Potential Energy – is energy in storage aka latent heat or hidden energy. Cannot be measured with a thermometer

2. Change in State (Phase Change) Change in state is a change in potential energy Known as latent heat because it does not cause a temperature change During the phase change energy can be absorbed or released but the energy is hidden because it DOES NOT SHOW A CHANGE IN TEMPERATURE

3. DURING CHANGE OF STATE, ENERGY IS CONVERTED TO POTENTIAL ENERGY OR STORED HEAT – DOES NOT SHOW A CHANGE IN TEMPERATURE Condensation and freezing – release energy Evaporation and melting – require energy

5. ¾ OF THE ENERGY ABSORBED BY EARTH EVAPORATES WATER FROM THE OCEANS EVAPORATION 540 CALORIES/GRAM GAINED 540 CALORIES/GRAM GAINED The gram of water absorbed 540 calories of latent heat as it changed to vapor ( require addition of energy ) COOLING EFFECT COOLING EFFECT CONDENSATION 540 CALORIES/GRAM RELEASED 540 CALORIES/GRAM RELEASED The gram of water released 540 calories of latent heat as it changed to liquid ( give off energy ) WARMING EFFECT WARMING EFFECT