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The only thing I can tell you is: For every 33.7 feet up from sea level you loose 1 atmospheric pressure and for every 33.7 feet below sea level you increase 1 atmospheric pressure... It is to my knowledge 33.7 is the measurement for a barometric loop... I think it has something to do with Mercury rising up in a glass tube?

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11y ago
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Q: Why barometric loop height is 33.7 feet?
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