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Given a scientific passage and an answer, generate a question for the given answer.

Passage: The pressure of a sample of gas is measured with an open-end manometer, partially shown to the right. The liquid in the manometer is mercury. Assuming atmospheric pressure is 29.92 in. Hg, determine the pressure of the gas in: (a) torr (b) Pa (c) bar. Answer: manometer
Output:
The pressure of a sample of gas is measured with an open-end what?