Why mercury is used in liquid barometer?

Mercury is employed in the barometer because its density is sufficiently high for a relative short column to be obtained. and also because it has very small vapour pressure at normal temperature. High density scales down the pressure head(h) to repesent same magnitude of pressure in a tube of smaller height.

Why mercury is used in manometer for determination of pressure head of water?

Mercury can be used because it has a high density and so the manometer size is minimised. Compared to water, a much smaller column of mercury is needed to measure pressure. The common types of manometer are the U-tube, the Well and the Inclined manometer.

Why mercury is used in manometer and state requirements of a liquid to be used as manometric liquid?

A common solution is the usage of mercury as a manometric liquid because its density and thermal expansion are well known [3], [4], [5], [6] and stable.

Why mercury is not used in manometer?

This is because mercury is 13.6 times more dense than water. In an open-tube manometer, one end of the tube is open to the atmosphere, and is thus at atmospheric pressure. The other end is connected to a region where the pressure is to be measured.

How is mercury measured?

The most commonly accepted methods of assessing mercury exposure are to test urine or blood. Both tests usually measure levels of total mercury (elemental, inorganic and organic). For most people, an elevated blood mercury level is associated with eating fish and other seafood containing organic mercury.

What does mercury measure?

3.38639 kPa. Inch of mercury (inHg and ″Hg) is a unit of measurement for pressure. It is used for barometric pressure in weather reports, refrigeration and aviation in the United States. It is the pressure exerted by a column of mercury 1 inch (25.4 mm) in height at the standard acceleration of gravity.

What is liquid mercury used for?

Although many liquids could be used in pressure measuring devices, mercury is used because its high density requires less space. It is also a good conductor of electricity, so it is a useful component of electrical switches. Mercury is also used in dental fillings, paints, soaps, batteries, and fluorescent lighting.

Where is liquid mercury found?

Like other metals, mercury is extracted from ores – one of the main varieties being cinnabar. It is found mostly in China, Spain and California. Droplets of liquid mercury can actually be found within the ore, though it is usually extracted through heating.