Heat can be transferred from hot places to cooler places by .
Liquids and gases are because they can be made to flow.
The in these fluids can move from place to place.
Convection occurs when particles with a lot of energy in a liquid or gas move and take the place of particles with less heat energy.
Liquids and gases expand when they are heated because the particles move when they are heated than they do when they are cold.
As a result, the particles take up more because the gap between particles widens, while the particles themselves stay the same size.
The liquid or gas in hot areas is less than the liquid or gas in cold areas, so it rises into the cold areas.
The denser cold liquid or gas into the warm areas.
In this way, convection that transfer heat from place to place are set up.