AP Physics 2
9.2 The Ideal Gas Law
9.1 Kinetic Theory of Temperature and Pressure
A rigid container of fixed volume \(V\) holds helium gas at a constant temperature \(T_0\). A small pinhole in the container allows helium atoms to slowly escape into a surrounding vacuum. The remaining gas inside the container is maintained at temperature \(T_0\) by a thermal reservoir. Over time, the magnitude of the rate at which internal pressure decreases, \(\left| \dfrac{\Delta P}{\Delta t} \right|\), is observed to diminish. Which of the following claims and justifications correctly explains why \(\left| \dfrac{\Delta P}{\Delta t} \right|\) diminishes over time?
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