why does Air move upwards
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As air warms up, the molecules start to vibrate and bump into each other, increasing the space around each molecule. ... The opposite effect happens when air cools. As the temperature drops, molecules move more slowly, taking up less room. The amount of space the air takes up shrinks, or reduces the air pressure.
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Hot air rises because when you heat air (or any other gas for that matter), it expands. When the air expands, it becomes less dense than the air around it. The less dense hot air then floats .
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