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A physical law describing the relationship of the measurable properties of an ideal gas, where P (pressure) × V (volume) = n (number of moles) × R (the gas constant) × T (temperature in Kelvin).
The relationship between temperature and volume, at a constant number of moles and pressure, is called Charles and Gay-Lussac's Law. In everyday life Gay-Lussac's Law can be applied to tire pressure. Tire pressure is sensitive to temperature because in the wintertime the cold air will cause lower the pressure in the tires which causes the tire pressure light on your car to come on. In the summertime, the warm air causes the pressure in your tire to expand and that can sometimes cause to have more pressure in your car than you need.
Charles's Law is an ideal gas law where at constant pressure, the volume of an ideal gas is directly proportional to its absolute temperature.
Charles's Law can be applied in everyday life when you get a balloon from the store. When you get a balloon and take it outside into the cold then you will see that the balloon will start to shrink. However, when you bring it back inside to a warm room then it will start to expand.
Boyle's Law describes the relationship between pressure and volume at constant temperature for a fixed mass* (number of molecules) of a gas.
Boyle's law is very important for Scuba divers because as they dive deeper into the water, the pressure increases in their body and decreases the volume in their lunges. However as they descend water pressure and the air expands. This is important because if they hold their breathe it can be very dangerous to them.