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In what states does convection happen?
Liquids and gases as it requires the movement of particles to transfer energy
Describe convection in liquids and gases
When a fluid is heated, particles gain kinetic energy causing them to move faster and further apart
This makes the fluid expand and rise upwards to become more buoyant
This heated fluid is less dense than unheated fluid, so it rises to the top
The fluid loses its heat eventually, making it become more dense and sink back to the bottom
This process is called a convection current, and it is how thermal energy is transferred in liquids and gases

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