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Chapter 20

The Energy of Waves

Thermal Energy The total energy of the particles in a material.
Temperature The Measure of the average kinetic energy of the particles of a sample of matter.
Heat The energy that is transferred from one material to another.
Specific Heat The amount of energy it takes to raise the temperature of 1 Kg of material 1 degree C.
3 ways to transfer thermal energy Conduction Convection Radiation
Conduction The transfer of energy through direct contact.
Convection The transfer of energy by the movement of a fluid.
Radiation The transfer of energy in the forms of waves.
Insulators A material that resists heat being transferred through it.
Conductors A material that allows heat to easily transfer through it.
R value The amount to which a material is resistant to heat flow. The higher the value the better an insulator it is.
Radiator A device with a large surface area designed to heat air or water by conduction.
Solar energy Energy from the sun
Passive solar heating Using windows and heat absorbing material to catch the energy from the sun.
Active solar heating Using solar collectors to heat water which is then pumped to radiators around.
Thermal Pollution Occurs when waste thermal energy changes the temperature of the environment.
Cooling tower Special structures designed to allow water to run down the inside walls and cool.
Heat engines Convert thermal energy into mechanical energy.
Internal combustion engines A system where fuel burned inside cylinders move "pistons" which turns an axle.
Power Stroke The spark plug produces a spark which ignites the mixture. The piston is forced down by the explosion.
Exhaust Stroke The piston moves up again and forces the waste products out the exhaust valve.
Heat pump A two way heat mover.
External combustion engines A system where fuel is burned outside of the engine (Steam engine).
Heat movers A device that removes thermal energy from one location and transfers it to another (refrigerator, air conditioner).
Heat of transformation (L) the amount of energy per Kg needed to undergo a phase change..
Heat of vaporization (Lv) the amount of energy needed for 1 Kg of a substance to undergo a phase change between a liquid and a gas. Liquid to gas, and gas to liquid
Created by: Kenmore Science