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When gas particles in the air are far apart e.g. spray of perfume
Millions of small collisions of particles against its container, the more particles the more pressure
Heating Air Pressure
When heated particles move faster and push harder so the pressure goes up, if it gets to high it can burst
When heat travels through solids
When heat travels through liquids and gases.
Only way heat travels through empty space, and is carried by infra-red waves
Filling black and white cans with hot water to see which one stays hottest for the longest
Melting wax on metal rods to see which metal best conducts heat
Convection Current Test
Heating dried beans in a beaker of water on one side and observing the movement of the beans
- Metals are good conductors
- Solids are better than liquids which are better than gases
- Gases are poor because the particles are more spread out
- Wood and plastic are good insulators
- Contain trapped air
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