mercury barometer

mercury barometer

noun
a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.
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Mercury barometer is always a great word to know.
So is lollapalooza. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
WordNet
mercury barometer

noun
barometer that shows pressure by the height of a column of mercury 
WordNet® 3.0, © 2006 by Princeton University.
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