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Boyle's Law

Why does pressure decrease as volume increases? Pressure is the force exerted by a gas on a surface. The amount of pressure is determined by the number of molecules striking the surface in a given period of time. If the volume is increased and the amount of gas held constant then the number of molecules per unit volume will decrease. Therefore the number of molecules striking the sides of the container will also decrease causing a decrease in pressure.

View the animation below, then complete the quiz to test your knowledge of the concept.






1Boyle’s Law states that...
A)P1V1 = P2V2
B)P1V2 = P2V1
C)P2V1 = P1V2
D)all of the above



2Boyle’s Law also states that...
A)at a constant temperature, the pressure exerted by a gas varies inversely with the volume of that gas.
B)at a constant temperature, the pressure exerted by a gas varies directly with the volume of that gas.
C)at a constant temperature, the pressure exerted by a gas remains the same no matter what the volume of that gas is.
D)at a constant temperature, the volume of a gas remains the same no matter what the pressure exerted by that gas is.



3An application of Boyle’s Law is...
A)at a constant temperature, as the pressure on a gas increases, the volume decreases.
B)at a constant temperature, as the volume of a gas increases, the pressure decreases.
C)at a constant temperature, as the pressure on a gas increases, the volume increases.
D)at a constant temperature, as the pressure on a gas decreases, the volume decreases.
E)A and B.



4As a volume of a gas increases, the number of molecules of that gas that collide with the walls of the container decreases.
A)True
B)False



5As the lungs expand while breathing, the pressure in the lungs decreases.
A)True
B)False







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