why is mercury used in a barometer

Why Is Mercury Used In A Barometer?

Complete answer: In the barometer mercury is used as the barometric liquid. … Mercury has high density. Because of this property, when there is a change in pressure the change in height of the mercury in the barometer tube will be very reasonable.

Why is mercury used as barometric liquid give three reasons?

(i) The density of mercury is greater than that of all the liquids, so only 0.76m height of mercury column is needed to balance the normal atmospheric pressure. (ii) The mercury neither wets nor sticks to the glass tube therefore it gives the correct reading.

What is the use of mercury barometer?

A mercury barometer is an instrument used to measure atmospheric pressure in a certain location and has a vertical glass tube closed at the top sitting in an open mercury-filled basin at the bottom.

What are the advantages of using mercury as a barometric liquid?

The advantages of use of mercury in a barometer are :

its density is very high.
it has low vapour pressure.
its rate of evaporation is not very high.
it neither wets nor sticks to glass.
its surface is shining and opaque.

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Why can’t we use water instead of mercury in barometer?

Explain why water cannot be used in place of mercury in a barometer? The atmospheric pressure at sea level = 76cm of Hg = 1.013×105 Pascal. That is, if water is used in barometer tube instead of mercury, the length of the tube must be greater than 10.326 cm. … So, we cannot replace mercury by water in the barometer.

What is mercury barometer?

A mercury barometer is a barometer with a column of mercury whose height varies according to the atmospheric (barometric) pressure. A barometer is an instrument for measuring atmospheric pressure, which is used in forecasting the weather.

What does the sudden fall in mercury in a barometer indicate?

Sudden fall in Mercury level: It signifies that there has been a fast fall in atmospheric pressure over the region. This will pool air from the surrounding regions vigorously and there is a possibility of storm in that area.

How is mercury barometer constructed explain?

(Or mercurial barometer; formerly called Torricelli’s tube.) The basic construction, unchanged since Torricelli’s experiment in 1643, is a glass tube about three feet long, closed at one end, filled with mercury, and inverted with the open end immersed in a cistern of mercury. …

What are uses of mercury?

Mercury is used primarily for the manufacture of industrial chemicals or for electrical and electronic applications. It is used in some liquid-in-glass thermometers, especially those used to measure high temperatures.

What are the advantages and disadvantages of a mercury barometer?

Following are the uses of mercury barometer:

To measure the altitude of a place.
To measure the air (atmospheric) pressure of a certain environment.
To know weather forecasting.
For the calibration of aneroid barometers.
To measure the pressure in aircrafts.
For analysis of surface water.

What is the major reason for using mercury in barometer rather than h2o?

In the barometer mercury is used as the barometric liquid. Mercury has many advantages when used as a measuring liquid in a barometer tube. Mercury has high density. Because of this property, when there is a change in pressure the change in height of the mercury in the barometer tube will be very reasonable.

How do you use a simple mercury barometer?

How does mercury barometer and aneroid barometer?

Photo: A Torricellian barometer (sometimes called a mercury barometer) is an inverted (upside-down) glass tube standing in a bath of mercury. Air pressure pushes down on the surface of the mercury, making some rise up the tube. The greater the air pressure, the higher the mercury rises.

How does a mercury barometer measure pressure?

What do gradual increase in mercury level in barometer indicate?

Gradual rise in mercury level is equal to good weather conditions or sunny days. Thus, no possibility of rain. Note:Remember that the glass tube is immersed in the mercury the air pressure in the atmosphere presses the surface of the mercury.

What do the following indicate in a barometer regarding weather i gradual fall in the mercury level 2 sudden fall in mercury level 3 gradual rise in mercury level?

Gradual fall in mercury level =The weather is going to be bad like stormy weather or thundering clouds.

What does the following indicate in a barometer regarding weather i gradual fall in the mercury level II sudden rise in the mercury level?

(b) sudden fall in the mercury level, (c) Gradual rise in the mercury level? (a) It indicates that the moisture is increasing i.e., there is a possibility of rain.

What is pressure explain the structure and working of mercury barometer?

Answer: : A Torricellian barometer (sometimes called a mercury barometer) is an inverted (upside-down) glass tube standing in a bath of mercury. Air pressure pushes down on the surface of the mercury, making some rise up the tube. The greater the air pressure, the higher the mercury rises.

Who invented the first mercury barometer?

Evangelista Torricelli

Italian physicist and mathematician Evangelista Torricelli, inventor of the mercury barometer. Two years later, pursuing a suggestion by Galileo, he filled a glass tube 4 feet (1.2 m) long with mercury and inverted the tube into a dish.Oct 21, 2021

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What are 3 uses for mercury?

Mercury is used in laboratories for making thermometers, barometers, diffusion pumps, and many other instruments. It is used for mercury switches and other electrical apparatus. It is used as an electrode in some types of electrolysis and for making batteries (mercury cells).

What are 5 interesting facts about mercury?

Facts about Mercury

Mercury does not have any moons or rings.
Mercury is the smallest planet.
Mercury is the closest planet to the Sun.
Your weight on Mercury would be 38% of your weight on Earth.
A solar day on the surface of Mercury lasts 176 Earth days.
A year on Mercury takes 88 Earth days.

What is tantalum used for?

One of the main uses of tantalum is in the production of electronic components. An oxide layer which forms on the surface of tantalum can act as an insulating (dielectric) layer. Because tantalum can be used to coat other metals with a very thin layer, a high capacitance can be achieved in a small volume.

Why did we stop using using mercury barometer aneroid barometer?

Aneroid barometers slowly replaced mercury barometers because they were easier to use, cheaper to buy, and easier to transport since they had no liquid that could spill. Some aneroid barometers use a mechanical tool to track the changes in atmospheric pressure over a period of time.

What are the limitations of the mercury barometer?

what are the limitations of the mercury barometers?

Disadvantage of a mercury barometer:
A major disadvantage of the mercury barometer is its bulk shape and fragile glass tube.
The mercury levels may be difficult to read under unsteady conditions, as on board a ship at sea.

Are mercury barometers banned?

The European Union assembly agreed to ban the sale of non-electrical instruments containing the toxic heavy metal, such as thermometers for taking people’s temperatures at home. … The ban, already endorsed by EU states, will apply to new devices only.

How does a mercury barometer move?

The best advice we can give is to just tilt the barometer slowly and gently to 45 degrees and let the top of the tube fill with mercury, then transport the barometer at that angle. Be sure to wrap the barometer in a good, stout plastic bag to contain any possible mercury spills, and cushion it well.

How do you set a mercury barometer?

How do you read a mercury barometer?

There are two forms of mercury barometer; stick (you read the mercury height by looking directly at the top of the column inside the glass tube, and compare it to a scale of inches printed or engraved beside the column), and dial, also known as wheel or banjo (you read from a hand pointing to numbers on a dial, …

How does mercury barometer look like?

A mercury Barometer otherwise known as the Torricellian barometer is made up of an upside-down long glass tube of length three feet which is closed at one of the ends and the open end is made to stand in the glass reservoir filled with mercury.

What is mercury barometer Class 9?

Mercury Barometer

It consists of a glass column with mercury and inches markings on it. The top end of the tube is closed and the bottom end is rested in a cup containing mercury known as a cistern. To increase the accuracy, these barometers are corrected for ambient temperature and the local value of gravity.

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.

Are mercury barometers accurate?

The accuracy of mercury barometers depends on the accuracy of the height measurement, density and vapor pressure of the mercury used. Mercury barometers are impractical for many industrial applications and their use has diminished over time due to their size, cost, delicate nature, and toxicity of mercury.

Who invented the mercury barometer and what is it used to measure?

Evangelista Torricelli

Evangelista Torricelli invented the mercurial barometer Barometer – Pronunciation: [b u rom´ u t u r] – a barometer is an instrument for measuring atmospheric pressure. Two common types are the aneroid barometer and the mercurial barometer (invented first).Jan 28, 2019

What happens to the level of mercury in the barometer tube when it is taken down a coal mine?

the temperature will increase as one moves down the Earth’s crust. and since there is almost very less wind so the warm will be not able to distribute the temp. and moderate it. Hence the Mercury will rise in the barometer tube.