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mercury barometer
An instrument used to measure atmospheric pressure. A glass tube about one meter long, with one end closed and the other end open, is filled with mercury, and the open end is submerged in a bowl, or cistern, of mercury. The mercury in the tube will drop down, leaving a vacuum above the mercury in the closed end.
Atmospheric pressure pressing down on the mercury in the bowl holds the mercury up inside the tube. The height of the top of the mercury in the tube above the level of the mercury in the bowl is an accurate measure of the amount of pressure produced by the weight of the atmosphere. Standard atmospheric pressure at sea level holds the mercury up in the tube to a height of 760 millimeters, or 29.92 inches.
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- Part of Speech: noun
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- Industry/Domain: Aviation
- Category: Aeronautics
- Company: Aviation Supplies & Academics
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