Instrument used to measure air pressure

What instrument is used to measure air pressure?

instrument used to measure air pressure

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Barometer , device used to measure atmospheric pressure. Because atmospheric pressure changes with distance above or below sea level , a barometer can also be used to measure altitude. There are two main types of barometers: mercury and aneroid. In the mercury barometer , atmospheric pressure balances a column of mercury, the height of which can be precisely measured. To increase their accuracy, mercury barometers are often corrected for ambient temperature and the local value of gravity. Common pressure units include pounds per square inch; dynes per square centimetre; newtons per square metre the SI unit called the pascal ; inches, centimetres, or millimetres of mercury; and millibars 1 millibar equals 1, dynes per square centimetre , pascals, or 0.

A barometer is a scientific instrument that is used to measure air pressure in a certain environment. Pressure tendency can forecast short term changes in the weather. Many measurements of air pressure are used within surface weather analysis to help find surface troughs , pressure systems and frontal boundaries. Barometers and pressure altimeters the most basic and common type of altimeter are essentially the same instrument, but used for different purposes. An altimeter is intended to be used at different levels matching the corresponding atmospheric pressure to the altitude , while a barometer is kept at the same level and measures subtle pressure changes caused by weather and elements of weather. Although Evangelista Torricelli is universally credited with inventing the barometer in , [1] [2] [3] historical documentation also suggests Gasparo Berti , an Italian mathematician and astronomer, unintentionally built a water barometer sometime between and

Mercury barometers consist of a glass tube about 80 cm long,closed at one end. The tube is filled with mercury and then placed,open end downward,in a reservoir of mercury. As the atmospheric pressure changes ,the level of the mercury changes and to a lesser degree,so does the level in the reservoir. The pressure is measured by the difference h between the levels. The space at the top of the tube is known as a torricellian vacuum.

A: A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. A simple barometer consists of a long glass.
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Using a Barometer to Measure Pressure Measuring Atmospheric Pressure Even though we can't see air , it is real and pushes on the things it surrounds. The push of the atmosphere is called pressure. Atmospheric pressure changes all the time. We can measure the pressure of the atmosphere with a mercury barometer or with an aneroid barometer. You can see they look very different in the picture to the left.



What instrument is used to measure atmospheric pressure?

A barometer using mercury is common. The atmospheric pressure presses down on a reservoir of mercury and the mercury is forced up the tube a certain distance depending on the pressure.

A barometer is any instrument that measures air pressure. Barometers come in two basic forms: the aneroid barometer and the mercury barometer. Aneroid barometers use cells that expand and contract as air pressure changes. Air pressure is measured by attaching a needle into these cells. A mercury barometer, on the other hand, uses mercury that rises and falls in response to air pressure changes.

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5 COMMENTS

  1. Hayden S. says:

    Measuring Atmospheric Pressure - Windows to the Universe

  2. Delit M. says:







  3. Jason G. says:







  4. Lahuen G. says:

    A barometer is any instrument that measures air pressure. Barometers come in two basic forms: the aneroid barometer and the mercury barometer. Aneroid.

  5. Reuben M. says:

    What instrument is used to measure atmospheric pressure? | How Things Fly

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