Gases and liquids are usually free to move about – this allows them to transfer heat by convection, which is much more effective than Conduction.
Convection occurs when the more energetic particles move from the hotter region to the cooler region – and take their heat energy with them.
This is how immersion heaters in kettles and hot water tanks and convector heats work.
Convection is impossible in solids because the particles can’t move.
Convection currents are all about changes in density.
Any liquid or gas follows the same ‘convection’ processes.
IMMERSION HEATER EXAMPLE:
1. Heat is transferred from the…