<span>The pressure exerted by a gas on its container is directly proportional to the absolute temperature of the gas.
This result is known as "Gay-Lussac law", which states that for an ideal gas with fixed volume (like the gas in the container), the ratio between pressure and absolute temperature of the gas is constant:
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<span>where p is the pressure of the gas and T its absolute temperature.</span>
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The transfer of energy means, in convention process, transport of matter. In this case, hot water has lower density than cool water. The water with less density ascends and leaves gaps that are occupied with cooler water "packages".