![]() ![]() Boyle’s law describes the relationship between volume and pressure in a gas at a constant temperature. At a constant temperature, changing the volume occupied by the gas changes the pressure, as does changing the number of gas molecules. Therefore, the pressure is lower in the two-liter container and higher in the one-liter container. In this case, the force exerted by the movement of the gas molecules against the walls of the two-liter container is lower than the force exerted by the gas molecules in the one-liter container. ![]() For example, a certain number of gas molecules in a two-liter container has more room than the same number of gas molecules in a one-liter container ( (Figure)). In a gas, pressure is a force created by the movement of gas molecules that are confined. ![]() Inspiration (or inhalation) and expiration (or exhalation) are dependent on the differences in pressure between the atmosphere and the lungs. ![]()
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