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According to the Ideal Gas Law, pressure, temperature and density are related by a constant:
P = ρRT
For this equality to hold at a given pressure, high temperature must correspond to low density.
2. A layer of dense air causes a higher pressure beneath it than an equally thick layer of less dense air.
3. As air above land warms during the day, it expands and becomes less dense, causing a higher pressure beneath it.
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