Mercury is poured into a tall glass ethyl alcohol which, Ask an Expert

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Mercury is poured into a tall glass. Ethyl alcohol (which does not mix with mercury) is then poured on top of the mercury until the height of the ethyl alcohol itself is 131 cm. The air pressure at the top of the ethyl alcohol is one atmosphere. What is the absolute pressure at a point that is 7.70 cm below the ethyl alcohol-mercury interface?

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