When the volume is held constant, the pressure exerted by a gas is directly proportional to the absolute temperature of the gas. The law is also known as Gay-Lussac's law of pressure temperature. Gay-Lussac formulated the law between and while building an air thermometer. What would the pressure of the gas be if the gas was heated to 77 C? To solve the problem, just work through the following steps: The cylinder's volume remains unchanged while the gas is heated so Gay-Lussac's gas law applies.
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This law shows a direct relationship between temperature and pressure: as temperature increases, pressure will increase proportionally. Mathematically, we can solve for the change in pressure by inputting the change in temperature. The second temperature is equal to twice the first temperature. For the fractions to remain equal, the second pressure must also be twice the first pressure.
Propane tanks are widely used with barbeque grills. But it's not fun to find out half-way through your grilling that you've run out of gas. You can buy gauges that measure the pressure inside the tank to see how much is left. The gauge measures pressure and will register a higher pressure on a hot day than it will on a cold day. So you need to take the air temperature into account when you decide whether or not to refill the tank before your next cook-out.