Why Is The Fluid In A Barometer Mercury

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A barometer is a scientific instrument used to measure atmospheric pressure also called barometric pressure. The atmosphere is the layers of air wrapped around the Earth. That air has a weight and presses against everything it touches as gravity pulls it to Earth. Barometers measure this pressure.

Why is mercury not suitable as the liquid in the U tube?

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.

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.

Which property of mercury is the main reason for use in barometer Mcq?

Mercury has a very low vapor pressure when compared to that of water. So it is more sensitive than water to the changes in the atmospheric pressure and rises more quickly to record the changes in the atmospheric pressure.

What will happen if water is used in place of mercury in a barometer tube?

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.

How does a water barometer work?

A water barometer is a device that uses water to measure barometric pressure. The device uses the force of gravity combined with pressure in the air to create a vacuum which in turn gives a reading that indicates the barometric pressure changes that are taking place in a specific area.

What is barometric liquid?

Barometric Liquid ( Defined ) A barometer is an instrument used to measure atmospheric pressure and the liquid inside it used to measure the atmospheric pressure is barometric liquid. Barometer uses Mercury ( A highly Poisonous liquid metal) as it’s liquid.

How do you read a mercury barometer?

How does the barometer explain the simple mercury barometer to measure atmospheric pressure?

One is a mercury barometer and the other is an android barometer. In an aneroid barometer the atmospheric pressure is measured by using the expansion of a metal. But in a mercury barometer the height of mercury is adjusted to measure atmospheric pressure.

Why is water not a suitable barometric liquid II Why is mercury used as a barometric liquid III name four factors which affect barometric height at a given place?

hola!! water cannot be used as barometric liquid because it’s density is lower than Mercury . water’s density is 1000 gram per cubic meter. hence it requires a barometer whose height is around 11 meters.

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.

Why is water used as a barometric liquid?

The density of water is low hence 10.4m height of water column is required in order to balance the normal atmospheric pressure. However it is not convenient to take a tube of height 10.4m for a barometer. The vapour pressure of water is high the vapours in the vacuum space will make the reading inaccurate.

Why are barometers installed inside rather than outside the building?

Because most buildings are not built air-tight air pressure can equalize inside the building so yes you are generally under the same air pressure inside a building as you are outside.

How do you make a mercury barometer?

How do you read a water barometer?

Look at the water in the spout of the barometer. If the water holds steady around the middle of the spout you’ll have good weather. The water should never dip below this middle amount so it’s the default position of the water. Check to see if the water creeps up the spout.

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Why was the barometer invented?

Barometer – History of Barometer

Evangelista Torricelli is the inventor of the barometer which is a device that can measure air pressure. He made the first barometer in Florence Italy in 1644. … He realized that if air had vertical weight the pressure would be lower at higher altitudes.

What is the basic principle of barometer?

A barometer is essentially a balance. The weight of the atmosphere is balanced by the weight of a much shorter mercury column. You can’t use an ordinary pan balance to weight the atmosphere (because air is pushing down on both sides).

How does a barometer predict weather?

Weather forecasters use a special tool called a barometer to measure air pressure. Barometers measure atmospheric pressure using mercury water or air. … Forecasters use changes in air pressure measured with barometers to predict short-term changes in the weather.

Why mercury is used in U-tube manometer?

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 used in Venturi meter?

A Venturi-meter and a mercury filled U-tube manometer is used to measure the flow of water which flows upwards in an inclined pipe with diameter of 0.12 m (figure 1). … Take the relative density of mercury to water as 13.6 and the acceleration due to gravity to be 9.81 m/s2.

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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 do the following indicate in a barometer regarding the weather 1 sudden fall in the mercury level 2 gradual rise in the mercury level?

It indicates that the moisture is decreasing i.e. it indicates dry weather.

What does sudden fall in barometric height indicate?

Sudden fall in barometric height indicates the strong wind or storm.

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