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AQA Heat 1
Beginners - G - E
| Term | Definition |
|---|---|
| condensation | when a gas turns into a liquid and looses some energy |
| evaporation | when a liquid turns into a gas and then takes heat energy away from the liquid |
| conduction | heat moves through a solid by passing on vibrations, like when a metal gets hot |
| convection current | this happens in air or in liquid, the hot particles move up and the cold particles sink down |
| infrared radiation | this happens when hot things give off heat in waves, you don't have to touch it to feel warm |
| conductor | lets heat pass through it easily |
| insulator | does not let heat in or out easily |
| more dense | lots of particles in a space |
| less dense | few particles in a space |
| emit | to give out |
| black surfaces | good at taking heat in and giving it out |
| white and shiny surfaces | bad at taking heat in and giving it out |
| absorb | to take in heat |
| solid | particles are packed very close together and vibrate |
| liquid | particles are touching but can move about and flow over each other easily |
| gas | particles are very spread out and move around very quickly |
| kinetic energy | movement energy |
| thermometer | the piece of equipment that we measure temperature with |
| contract | to take up less space |
| expand | to take up more space |
| thermal | another word for heat |
| fluid | liquid or a gas |
| cavity wall insulation | is put in between the gaps in walls of houses to keep the house warm in winter and cool in summer |
| U-value | is how quickly parts of a building loose heat |
| Solar panels | absorb heat (infrared radiation) from the Sun to warm up water |
| mass | is measured in kilograms (kg) |
| energy | is measured in Joules (J) |
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