Discussion
Assertion (A): A barometer measures the weight of the air above it.
Reason (R): Hydrostatic balance requires the pressure at a level to equal the weight per unit area of the overlying column.
Select the correct answer from the options below.
Answer: D
Integrating the hydrostatic equation from the level of the instrument to the top of the atmosphere gives exactly that result. The reason therefore explains the assertion completely. It follows that surface pressure changes reflect redistributions of mass, which is why the surface pressure tendency equation involves the vertically integrated divergence rather than any local thermal effect.
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