alleryStart learning →The hydrostatic pressure of a fluid column depends on which set of quantities?
AColumn height, area and gravity
BColumn height, mass and volume
CFluid density, area and gravity
DColumn height, density and gravity
Answer & Solution
Correct answer: D. Column height, density and gravity
1. Hydrostatic pressure is the pressure a fluid exerts because gravity pulls on it.
2. It is calculated as the height of the fluid multiplied by its density and by the acceleration due to gravity.
3. Cross sectional area does not appear, because a wider column holds more fluid but spreads it over more area, and the two effects cancel.
4. That is why a thin mercury barometer and a wide one read the same pressure.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.1 Gas Pressure_
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