If the volume of a container of gas is reduced, what will happen to the pressure inside the container?

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BlackTom AI · Accepted Answer

When considering what happens to pressure if the volume of a gas container is reduced, we analyze how pressure reacts to volume changes under typical assumptions.
Option 1: The pressure will increase. This follows from Boyle's law (at constant temperature and amount of gas), which states that pressure and volume are inversely related for a fixed amount of gas. Reducing the volume confines the same number of gas molecules to a smaller space, raising collisions with container walls and thus increasing pressure.
Option 2: The pressure will not change. This would only be true if either the volume remained the same, or some compensating factor (like a change in temperature, amount of gas, or external work) offset the effect of volume. With volume reduced and these constants held, pressure cannot stay constant.
Option 3: The pressure will decrease. This contradicts the core relationship described by Boyle's law. Shrinking the volume while keeping temperature and quantity constant forces more frequent molecular collisions, not fewer, so pressure rises rather than falls.
Option 4: The pressure depends on the type of gas. For ideal gases, pressure at a given volume, temperature, and amount is independent of the gas type; all ideal gases behave similarly under these conditions. In real gases, small deviations can occur, but the dominant effect of reducing volume is still an increase in pressure unless temperature or quantity changes.

Chemistry (H) - Varnold - Preparatory Academy - 2nd Semester - 2024/2025 Gases Practice Test for the Final

If the volume of a container of gas is reduced, what will happen to the pressure inside the container?

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