Energy: Conservation and

Transfer

Heat

• The transfer of energy between objects that are at 2 different temperatures

Conduction

• Conduction is the transfer of heat by the collision of particles; the particles must touch in order to transfer heat. Metals are considered good conductors since they can speedily transfer heat. Stone is also a moderately good conductor, but wood, paper, air, and cloth are poor heat conductors.

Convection

 Transfer of heat from one place to another by the movement of fluids or gases

Radiation

• The energy radiated by electromagnetic waves through empty space as a result of their temperature; heat travels outward from its source 

 Transfer

• to convey or remove from one object, place, person, etc., to another

Electromagnetic Waves

• Electromagnetic waves are formed when an electric field (shown as blue arrows) couples with a magnetic field (shown as red arrows).

• When you listen to the radio, watch TV, or cook dinner in a microwave oven, you are using electromagnetic waves.

Thermal Energy

Thermal energy is the energy of a substance due to the movement of its atoms or molecules.  More the molecules are moving about, the higher the temperature.

Convection Cell

• Moving body of fluid due to the rise of heat and fall (gravity) of cool gases until the heat is no longer heated (Ex. Current/cycle)

• Convection cells are responsible for making macaroni rise and sink in a pot of boiling water. One of the forces that contributes to lava erupting from a volcano is convection.

Insulator

• A material that does not conduct heat very well

• Ex: foam, paper, plastic, wood

Conductor

• A material that gets hot and cools off very quickly

• Ex: metal, water