Discussion
Which physical statement does the hydrostatic equation encode?
Answer: C
Integrating the equation from a level to the top of the atmosphere shows that the pressure at any level equals the weight per unit area of everything above it. A barometer is therefore weighing the atmosphere. This interpretation makes surface pressure changes intelligible as redistributions of mass rather than as local thermal effects. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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