Because it has a high density... meaning that the volume increase or decrease due to altitude change is can be viewed in a practical sized barometer. If water, which had a much lower density, was used instead of Mercury, the barometer must be at least 15m high.
Mercury is used in barometers due to its high density. This allows mercury to be used in a small container. If you used water for example, which has a low density, your barometer would have to be around 15-34 meters tall.
I don't think its much used in manometers, which measures pressure. But due to its nice range of expansion and contraction over temperature it is widely used in thermometers. There is one special kind of manometer where mercury is fairly common though, and that's in the barometer, which measures the atmospheric pressure, which can be helpful if you're trying to predict weather.
Mercury is a dense liquid with a very high boiling point and low vapor pressure. The atmospheric air pressure balances the weight of the mercury against a Torriceli vacuum that exists at the top of the column. If you used any other liquid it would flash to vapor in the vacuum and the column would be unusably tall.
Mercury barometer is used for measuring atmospheric pressure.
Because atmospheric pressure changes with distance above or below sea level, a barometer can also be used to measure altitude.
Mercury (Hg) is preferred in a barometer because it is very dense (13.6 times that of water). Normal atmospheric pressure at sea level will support a column of Hg nearly 30 inches tall. But it will support a column of water about 30 feet high. That would be a big barometer...
Water for all practical purposes is an uncompressible fluid. It can serve the purpose of a manometer as well as mercury. however since mercury is poisonous and dangerous, therefore water is preferred.
Water will freeze and break the glass tube. Mercury won't. Mercury is extremely stable and won't change to a solid or a gas. Water will.
Because it is a liquid with a very high density and rather low partial vapor pressure at normal temperatures.
A mercury barometer is an instrument used to measure atmospheric pressure.
Water was initially used and later on alcohol was used.
A barometer is an instrument used to measure atmospheric pressure. It can measure the pressure exerted by the atmosphere by using water, air, or mercury. Pressure tendency can forecast short term changes in the weather. Numerous measurements of air pressure are used within surface weather analysis to help find surface troughs, high pressure systems, and frontal boundaries.
Some of the weather equipment are: Radars, Barometers, Thermothers, and Rain Gauges. This is just some of many and the world advances.
Mercury is a liquid at room temperature and has a specific gravity which is higher than water and is not nearly as likely to vaporize as water or alcohol.
Being the only metal which is liquid at room temperature mercury has some specialist uses: It is also used in barometers an manometers due to its high density. From this it has also become a way of measuring pressure in millimeters of mercury. It has also been used as liquid electrolyte for the production of chlorine and sodium hydroxide from the electrolysis of brine but is again being phased out in favor of safer alternatives. It is still sometimes used in electrical switches as a liquid contact. Mercury also used to be used as a component for dental amalgams for making fillings for teeth. This process has again been phase out due to health concerns but many people still have mercury containing fillings and crematoria are thought to emit about 5kg of mercury each year simply from dental fillings. The amalgam of 70% silver and 30% tin when mixed with mercury formed a pliable material that could be inserted into the tooth and the amalgam expanded as it dried to fill the entire cavity. However this amalgam has been replaced by a similar one made from 60% silver, 27% tin and 13% copper.
Mercury
mercury
Historical, both thermometers and barometers have used mercury.
They are more portable and can be used for airplane equipment
Mercury is used in thermometers barometers and flourescent lightbulbs.
In the mercury barometer, atmospheric pressure balances a column of mercury, the height of which can be precisely measured. Other liquids can be used in barometers, but mercury is the most common because of its great density.Mainly due to its high density
Science and industrial labs often use mercury filled barometers due to mercury's high density and low vapour pressure. This allows the barometers column of liquid to be less than 1 meter high (760 mm Hg=1 atmosphere). As an additional advantage the meniscus of the mercury is upwards at the center, unlike water, making accurate reading simpler. However mercury's toxic attributes make it hazardous if spilled, so mechanical diaphragm barometers are often used.
Mercury was commonly used in thermometers and barometers. However, because it is poisonous, people are trying to use it in less things now.
Mercury was commonly used in thermometers and barometers. However, because it is poisonous, people are trying to use it in less things now.
inches in mercury and millibars Barometers .
Barometers are used to measure pressure.
Barometers can use any liquid. A dense liquid that makes for a short column at room temperature, is mercury.