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- Created by: hattie townsend
- Created on: 09-03-16 16:08
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- P1.1 - Energy Transfer
- Conduction
- Transfer of heat without the substance itself moving
- Metals are good conductors because
- As the metal becomes hotter, the atoms vibrate vigorously so this energy is transferred to the cooler parts of the metal by the free electrons
- Insulators are materials that have few or no free electrons
- Convection
- Transfer of energy by heating through the movement of particles
- Convection occurs in liquids and gases, creating convection currents
- 1) Particles in the liquid or gas nearest the energy source move faster, causing the substance to expand and become less dense
- 2) Warm liquid or fas rises vertically. As it does, it cools, becomes denser and sinks
- 3) The colder, denser liquid or gas moves into the space created and the cycle repeats
- Evaporation
- Transfer of energy at the surface of a liquid
- When water evaporates = water vapour
- 1) Atoms that are moving most rapidly are located at the surface of the liquid, they behave like a gas and escape
- 2) Overall energy will reduce. This results in a fall of temperature.
- Transfer of energy at the surface of a liquid
- Condensation
- When a gas or vapour returns to a liquid state
- Conduction
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