|Series||Its Notes on applied science,, no. 9|
|LC Classifications||QC165 .T4|
|The Physical Object|
|Number of Pages||15|
|LC Control Number||55057157|
Get this from a library! Measurement of pressure with the mercury barometer.. [National Physical Laboratory (Great Britain)]. Measurement of Pressure with the Mercury Barometer. Measurement of Pressure with the Mercury Barometer. Nature , ( Books and Culture; Podcasts; Videos;. CHAPTER 2. ATMOSPHERIC PRESSURE MEASURING ATMOSPHERIC PRESSURE The atmospheric pressure is the weight exerted by the overhead atmosphere on a unit area of surface. It can be measured with a mercury barometer, consisting of a long glass tube full of mercury inverted over a pool of mercury: Figure Mercury barometerFile Size: 59KB. Mercury is also very dense which means the barometer won't need to be as tall as if you used something like water. A water barometer would need to be over 30 feet tall. With mercury you will need only a 30 inch tall column to balance the weight of the atmosphere at sea level under normal conditions (remember the 30 inches of mercury pressure units mentioned earlier).
Pressure data measured with the barometer should preferably be expressed in hectopascals (hPa). Principle of Atmospheric Pressure Measurement Mercury Barometer (1) Principle of mercury barometer When a one-meter long, open ended glass tube is filled with mercury and is then turned upside down into a containerFile Size: KB. A mercury thermometer, that is a barometer can be used to measure vapor pressure. Initially, a proper temperature must be recorded. Then the liquid should be injected into the mercury column. In barometer. 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. The barometer works by balancing the weight of mercury in the glass tube against the atmospheric pressure, much like a set of scales. Atmospheric pressure is basically the weight of air in the atmosphere above the reservoir, so the level of mercury continues to change until the weight of mercury in the glass tube is exactly equal to the weight of air above the : Jenny Worboys.
moisture changes. The instrument used to measure air pressure is the barometer. In the mercury barometer, the mercury (Hg — see bottom of the chart) is held up by the atmospheric pressure to a height of around 30 inches. This height, reflecting the atmospheric pressure, changes with changing air temperature and moisture content. Typically, if File Size: 1MB. Atmospheric pressure was first measured with a barometer. A barometer consists of a large dish and a long glass tube that is sealed at one end. The tube and dish are filled with mercury (HG) or some other liquid, and the tube is inverted into the dish. Mercury barometer. Atmospheric pressure supports a column of mercury of approximately mm Hg. Standard atmospheric pressure = bar = mbar = Pa. Gauge pressure p g = p – p a. where: p = absolute pressure, p a = atmospheric pressure. Manometers. UNITEDSTATESDEPARTAIEXTOFCOMAIERCE• r,Secret, ,Director MercuryBarometersandManometers cher,D.P.