Discussion
Consider the following statements about hydrostatic balance.
1. It holds to about one part in a hundred million for synoptic motion.
2. It fails in deep convection.
3. It requires the atmosphere to be at rest.
Which of the statements given above is or are correct?
Answer: C
The first two statements are correct, but the balance does not require the atmosphere to be at rest, only that the vertical acceleration be negligible compared with gravity. Horizontal motion of any speed is perfectly compatible with it. Confusing hydrostatic with static is a natural slip that the etymology encourages.
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