alleryStart learning →Pressure is defined as which of these quantities?
AThe force exerted on a given area
BThe mass carried by a given volume
CThe energy stored in a given volume
DThe force needed to lift a given mass
Answer & Solution
Correct answer: A. The force exerted on a given area
1. Pressure is force divided by area, so it counts how hard a force presses on each unit of surface.
2. Pressure therefore rises when the force rises, and rises again when the same force is squeezed onto a smaller area.
3. Mass per volume is density, not pressure, and energy per volume is a different quantity again.
4. The force needed to lift a mass is just a force, with no area in it, so it cannot be a pressure.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.1 Gas Pressure_
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