Hot Stuff

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

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

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