Barometer

[Ba*rom·e*ter]

A barometer is a device that measures atmospheric pressure. Barometers help meteorologists figure out what the weather is going to be like.

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An instrument for determining the weight or pressure of the atmosphere, and hence for judging of the probable changes of weather, or for ascertaining the height of any ascent.

Noun
an instrument that measures atmospheric pressure

n.
An instrument for determining the weight or pressure of the atmosphere, and hence for judging of the probable changes of weather, or for ascertaining the height of any ascent.

Barometer

Ba*rom"e*ter , n. [Gr. weight + -meter: cf. F. barom'8atre.] An instrument for determining the weight or pressure of the atmosphere, and hence for judging of the probable changes of weather, or for ascertaining the height of any ascent. &hand; The barometer was invented by Torricelli at Florence about 1643. It is made in its simplest form by filling a graduated glass tube about 34 inches long with mercury and inverting it in a cup containing mercury. The column of mercury in the tube descends until balanced by the weight of the atmosphere, and its rise or fall under varying conditions is a measure of the change in the atmospheric pressure. At the sea level its ordinary height is about 30 inches (760 millimeters). See Sympiesometer. Nichol. Aneroid barometer. See Aneroid barometer, under Aneroid. -- Marine barometer, a barometer with tube contracted at bottom to prevent rapid oscillations of the mercury, and suspended in gimbals from an arm or support on shipboard. -- Mountain barometer, a portable mercurial barometer with tripod support, and long scale, for measuring heights. -- Siphon barometer, a barometer having a tube bent like a hook with the longer leg closed at the top. The height of the mercury in the longer leg shows the pressure of the atmosphere. -- Wheel barometer, a barometer with recurved tube, and a float, from which a cord passes over a pulley and moves an index.

An instrument for determining the weight or pressure of the atmosphere, and hence for judging of the probable changes of weather, or for ascertaining the height of any ascent.

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Usage Examples

The arts are an even better barometer of what is happening in our world than the stock market or the debates in congress.

At the end of the day, sleep is a barometer of your emotional health. And so if you're not in the right place where you need to be, then you're going to have voices keeping you up at night because you have to work through those issues.

Misspelled Form

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Other Usage Examples

Money is the barometer of a society's virtue.

When you do a drama, you are challenged to trust your inner voice much more. Because when you put a comedy in front of even a 25-person screening, you know whether it's working or not. The barometer is overt.