Heat makes the molecules move a lot more faster. Fluids such as air and water typically become less dense when they are heated, causing them to be pushed sideways and upwards by the colder, more-dense fluid around them that is being pulled more strongly down by gravity.
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Answer:
Heat makes the molecules move a lot more faster. Fluids such as air and water typically become less dense when they are heated, causing them to be pushed sideways and upwards by the colder, more-dense fluid around them that is being pulled more strongly down by gravity.