alleryStart learning →What causes a gas to exert pressure on the surface of an object?
AThe chemical bonds inside the gas
BThe weight of the object on the gas
CThe heat given out by the gas itself
DGas molecules colliding with the surface
Answer & Solution
Correct answer: D. Gas molecules colliding with the surface
1. Gas molecules move constantly and strike whatever surfaces enclose them.
2. Each single collision delivers a tiny force, but any surface of reasonable size takes a huge number of them every second.
3. Adding those forces over the area gives the pressure the gas exerts.
4. Ordinary air pressure is strong enough to crush a metal container that is not braced by equal pressure inside.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.1 Gas Pressure_
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