No convection current is set up in air and water in the test tube when the heat source is not at the_______
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Explanation:
Convection
Heat can be transferred in liquids or gases by convection.
Fluids
Liquids and gases are fluids because they can be made to flow.
The particles in these fluids can move from place to place.
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.
Convection in a liquid
Convection in a liquid can be seen by putting a crystal of potassium permanganate in a beaker of water and gently heating it with a Bunsen flame.
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