why mercury is used in barometer
Why Mercury Is Used In 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 mercury is used in pressure 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 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.
Why is mercury preferred over water in a barometer?
Mercury is used in barometers and not water. This is because the high density of mercury gives a reasonable height of the column to measure atmospheric pressure. While a barometer using water, for instance, would need to be 13.6 times higher column length than a mercury barometer to obtain the same pressure difference.
Which mercury is used in barometer?
EXPLANATION: So, a mercury barometer is a device used to measure atmospheric pressure and mercury is used in it because of its low density. So, High density is the correct answer.
What is a mercury barometer?
mercury barometer
See also where is a tributaryNoun. tool that determines atmospheric pressure by measuring how much mercury moves in a glass tube.
How does a mercury barometer work?
How does a barometer work? Simply put, a barometer acts like a balance that ‘balances’ the weight of the atmosphere (or air around you) against the weight of a mercury column. If the air pressure is high, the mercury will rise. At low air pressure, the mercury goes down.
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.
What are the limitations of a 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.
Do barometers contain mercury?
Though other liquids can be used in a barometer, mercury is the most common. Its density allows the vertical column of the barometer to be of manageable size.Who made the 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
How do you use a simple mercury barometer?
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.
Why is water not a suitable barometric liquid?
Water is not a suitable barometric liquid because: (i) The vapour pressure of water is high, so its vapours in the vacuum space will make the reading inaccurate. (ii) Water sticks with the glass tube and wets it, so the reading becomes inaccurate.
What is the principle of an aneroid barometer state its advantages over a mercury barometer?
The aneroid barometer is more durable and compact, and much easier to read. The only particular advantage of a mercury barometer is that it’s a direct measurement — there’s no calibration involved. If you can measure the height of the column above the pool and you know the density of mercury, you have the pressure.
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 function of simple mercury barometer?
Mercury Barometers are primarily used for measuring atmospheric pressure. The atmosphere(or the air) pushes down the mercury in the vessel, which in turn pushes the mercury in the tube up. And the height of mercury in this tube is used as a measure.
What is the difference between aneroid barometer and mercury barometer?
The main difference between aneroid and mercury barometer is that aneroid barometer measures the atmospheric pressure using the expansion of a metal whereas mercury barometer measures the atmospheric pressure by adjusting the height of mercury inside a tube.How do barometers work without mercury?
That’s why most people who own barometers have ones with easy-to-read dials, which are called aneroid barometers. Instead of having a pool of mercury that the atmosphere pushes down on, they have a sealed, air-tight metal box inside.How do you make a mercury barometer?
Which barometer does not employ mercury?
aneroid barometer An aneroid barometer is made without fluid. It consists of a small, flexible metal box called an aneroid capsule, which is made from an alloy of beryllium and copper.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, …What is the working principle of barometer?
Thus, in a barometer, one end is sealed to prevent air from disturbing the scale and measures. Therefore, a Mercury Barometer works on the principle of balancing the atmospheric pressure with the volume of mercury present in the device.Who invented millibar?
By the barometric formula, 1 bar is roughly the atmospheric pressure on Earth at an altitude of 111 metres at 15 °C. The bar and the millibar were introduced by the Norwegian meteorologist Vilhelm Bjerknes, who was a founder of the modern practice of weather forecasting.
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 does a mercury barometer measure pressure?
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.
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.
Why water Cannot be used in mercury 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.
Why water is used in barometer?
Note: Water has very strong adhesive forces than cohesive forces. Hence it usually sticks to the surface of any given material until and unless it’s hydrophobic. In a barometer we use mercury as a barometric liquid; it fulfills all the criteria that are required by a substance to use it as the liquid in a barometer.
What is the density of water?
997 kg/m³
See also what temperature scale is used in gas law calculationsWhat 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.
