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Chapter 20
The Energy of Waves
| Term | Definition |
|---|---|
| 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
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