Explain how convection occurs in fluids (liquids and gases). Make sure you use the following words in your explanation: expansion, contraction, mass, volume, density.
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Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. ... This is because the particles in liquids and gases move faster when they are heated than they do when they are cold. As a result, the particles take up more volume.
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