Boyles Law Volume and Pressure

The relationships between gas properties—such as the relationship between pressure and volume— are described by gas laws. These laws show how a change in one of these properties affects one or more of the others. The relationship between volume and pressure was discovered by Robert Boyle (1627-1691) and is called Boyle s law. 

I Boyle s law assumes constant temperature and a constant number of gas particles. 

Divers must ascend slowly and breathe continuously, allowing the regulator to bring the air pressure in their limgs back to 1 atm by the time they reach the surface. 

Boyle s law can be used to calculate the volume of a gas following a pressure change or the pressure of a gas following a volume change as long as the temperature and the amount of gas remain constant. For these calculations, we write Boyle s law in a slightly different way. 

This relationship is true because if the pressure increases, the volume decreases, but the product P X y is always equal to the same constant. For two different sets of conditions, we can say that 

This equation is another statement of Boyle s Law — and it s really a more useful one, because you normally deal with changes in pressure and volume. 

If you know three of the preceding quantities, you can calculate the fourth one. For excimple, suppose that you have 5.00 liters of a gas at 1.00 atm pressure, and then you decrease the volume to 2.00 liters. What s the new pressure Use the formula. Substitute 1.00 atm for Pj, 5.00 liters for Kj, and 2.00 liters for V, and then solve for P  

The answer makes sense you decreased the volume, and the pressure increased, which is exactly what Boyle s law says. 

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