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# Kinetic Theory Proper Explanation: Increasing Pressure and Mass

APPH12-CN2ULZ

A group of physics students studies the behavior of a gas by pumping air into a rigid $2.0\text{-liter}$​ bottle and then measuring the increasing mass of the bottle with a digital scale. The students worked slowly and all pressure readings were taken with the gas at room temperature ($293\text{ K}$). The five measurements are plotted on the graph above.

Which of the following statements below properly uses the kinetic theory to explain why the gas in this experiment shows an increased pressure?

A

The increased pressure is a result of the gas molecules moving faster each time more gas is pumped into the bottle.

B

The increased pressure is a result of a greater number of molecular collisions per time against the inner walls of the bottle.

C

The increased pressure is a result of the larger amount of kinetic energy that each molecule has over the course of the experiment.

D

The increased pressure is a result of the each gas molecule getting more massive over the course of the experiment, and thus delivering a greater impulse to the inner walls of the bottle.