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Read about "Boyles law"

http://www.grc.NASA.gov/WWW/K-12/airplane/aboyle.html

As temperature increases the volume OR the pressure of a mass of air will increase. If the volume of the air mass is constrained (inside a container of fixed size) the pressure will go up. If the mass of air is allowed to expand freely it will become less dense (lighter per unit volume)

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16y ago

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