When we lit the lamp Making the lamp heats up The air grew
in light volume limit. Can not be expanded by air. Therefore, part of the air out of the lamp (air expansion, making it one of the overflow from the lamp)
Therefore,
the volume of the same lamp. But there's less air mass. This makes it lighter than the air around it. It was the air around it in place or is the pressure of the air in the south of it, pushing it upwards.
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