Explain how warm air temperatures affect the density of the air

Explanation:

As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.

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the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.