1. Heat Energy

2. Heat and Temperature
Heat is the transfer of thermal energy from a warmer object to a cooler object.
Thermal Energy is the total energy of all the particles in an object.
Temperature is a measure of how hot or cold something is compared to a reference point.

3. Adding and Removing Heat
Adding heat to or removing heat from a system may result in a temperature change and possibly a change of state.
Solid, Liquid, Gas
Energy is the ability to do work or cause change.
State is the form in which matter exists.

4. Motion of Molecules
Solid: Definite shape, definite volume. Closely packed arrangement of particles that vibrate.
Liquid: Definite volume but no shape of its own. The particles are packed tightly but not as rigid as a solid. The particles are able to move around one another freely.
Gas: Has neither a definite shape nor definite volume. The particles spread out and move around freely.

5. Change of State Melting Point: The temperature at which a solid melts.
Boiling Point: The temperature at which liquid boils.
Melting: From a solid to a liquid.
Boiling: From a liquid to a gas.
Evaporation: The process by which molecules at the surface of a liquid absorb enough energy to change to gaseous state.
Condensation: A gas cools and condenses to a liquid.

6. Heat Flow
Conduction: Transfers heat from one particle of matter to another within an object or between two objects. By direct contact.
Convection: Heat transfer that occurs only in fluids, such as water and air.
Radiation: The transfer of energy by electromagnetic waves. Is the only form of heat transfer that does not require matter.