Heat transfer

When there is a different temperature between objects, heat will transfer between them. There are three different ways in which this happens:

Conduction:

When an object is heated up, it gains kinetic energy and the particles vibrate more. These particles hit other particles near by, making them vibrate faster as well. For conduction to work, the objects must be touching.

Convection:

Hot water rises because it becomes less dense. It turns to steam. This is why you boiler may be at the bottom of your house, because the hot water will rise up the pipes and cold water will fall down. This is because of the principle of bouyancy. The principle of bouyancy states that objects that are less dense will float and obejects that are more dense will fall. They will fall or float depending on how much gravity or bouyancy is actng in them.

Radiation:

All hot objects give out invisble heat waves called radiation. The hotter the object, the more radiation it gives out. The objects do not need to be touching for radiation to work. Hot objects radiate more heat than they absorb so cool down. However cold objects absorb more than they radiate to warm up.