in a mercury barometer, when air pressure increases, the mercury in the tube _____.

In A Mercury Barometer, When Air Pressure Increases, The Mercury In The Tube _____.?

When air pressure increases, the mercury in the tube rises. When air pressure decreases, so does the height of the mercury column.

What happens to the mercury in the barometer tube when the pressure increases?

There is a direct relation between the air pressure and height of mercury column. If atmospheric pressure increases, the height of mercury column will also increase.

When air pressure decreases the mercury in a barometer?

Atmospheric Pressure and Altitude

At sea level, a mercury column will rise a distance of 760 mm. This atmospheric pressure is reported as 760 mmHg (millimeters of mercury). At higher altitudes, the atmospheric pressure is decreased and so the column of mercury will not rise as high.

What happens to the liquid in the tube if air pressure increases?

The water in the tube rises and falls because of air pressure exerted on the water in the glass. As the air presses down (increased atmospheric pressure) on the water in the glass, more water is pushed up into the tube, causing the water in the tube to rise.

What does it mean when mercury rises in a barometer?

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.

How does a mercury barometer measure pressure?

What is a mercury barometer?

mercury barometer

Noun. tool that determines atmospheric pressure by measuring how much mercury moves in a glass tube.

What keeps mercury inside the tube in a mercury barometer?

Explanation: Atmospheric pressure will support a column of mercury 760 mm high.

Why mercury is used in 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 does the level of mercury in a barometer change when atmospheric pressure increases?

Since the number of air molecules above the surface increases, there are more molecules to exert a force on that surface. With an increased weight of air above the reservoir, the mercury level rises to a higher level.

Why does the level of mercury falls in a barometer while taking it to a mountain?

Explanation: Normal atmospheric pressure is 76 cm of mercury or about 10 m of water. … Up a mountain the air pressure is low and so the barometer reading will go down.

Which of the following is a difference between a mercury barometer and an aneroid 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 does air pressure affect water?

Atmospheric pressure influences the boiling point of water. When atmospheric pressure increases, the boiling point becomes higher, and when atmospheric pressure decreases (as it does when elevation increases), the boiling point becomes lower. Pressure on the surface of water tends to keep the water molecules contained.

What would happen to the column of mercury in the barometer as if the atmospheric pressure fell?

As the pressure falls, the column of mercury will drop lower. As the pressure falls, the column of mercury will remain unchanged. As the pressure falls, the column of mercury will rise higher.

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 do you set a mercury barometer?

What depth of mercury creates a pressure of?

This would be divided by the density of mercury which we know to be 13,600 kilograms per cubic meter multiplied by 9.80 meters per second squared and we find out the height of mercury in a the death of mercury. For one, atmospheric pressure would be 10.76 meters. This would be our final answer.

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

A mercury barometer is used to calibrate and check aneroid barometers. Calibration can be, for example, in terms of atmospheric pressure or altitude above sea level. The concept of altitude above sea level, based on barometric pressure, is used to create one type of aircraft altimeter.

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

What is atmospheric pressure at sea level on a mercury barometer?

Standard sea-level pressure, by definition, equals 760 mm (29.92 inches) of mercury, 14.70 pounds per square inch, 1,013.25 × 103 dynes per square centimetre, 1,013.25 millibars, one standard atmosphere, or 101.325 kilopascals.

What is mercury column?

The column of mercury employed in a mercury barometer, the height of which (inches of mercury) is used as a measure of atmospheric pressure. …

How is the mercury column supported in a barometer?

A standard mercury barometer to measure atmospheric pressure is a tube with one end sealed. … Again, if there is a difference in pressure between the two ends of the tube, a column of fluid can be supported in the tube, with the height of the column being proportional to the pressure difference.

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.

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.

How does the vapor pressure of mercury affect the pressure reading of the manometer?

When mercury is used as a liquid for manometer, the vapor pressure of water at 20 °C (2.33kPa) will produce 17.5mm of height difference. Procedure for measuring the saturated vapor pressure of a pure liquid at a specific temperature.

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.

Why does air pressure decrease with an increase in altitude?

At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels. … Since most of the atmosphere’s molecules are held close to the earth’s surface by the force of gravity, air pressure decreases rapidly at first, then more slowly at higher levels.

What happens when atmospheric pressure increases?

For example, if air pressure increases, the temperature must increase. If air pressure decreases, the temperature decreases. It also explains why air gets colder at higher altitudes, where pressure is lower.

When a barometer is put at a top of a mountain the height of mercury column in its tube is?

Like tilting a bottle of soda, the mercury will tilt in the tube so that the reading on the side closest to the earth will be higher and the side away would be lower. In (D) at the top of a mountain the air pressure is much lower so the vertical height will be lower.

How is the barometric height of a simple barometer affected if the barometer moved inside mine?

If the tube of a simple barometer is pushed down into the trough of mercury then the atmospheric force exerted on the tank will be adjusted by the mercury until the weight of the mercury column gets balanced. Hence the barometric height of a simple barometer remains unaffected.

What are the advantages of aneroid barometer over a mercury barometer?

Answer: 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.

What advantages does the aneroid barometer have over the mercury barometer choose all that apply quizlet?

The aneroid barometer can be connected to a recording mechanism. The aneroid barometer does not contain mercury, which is harmful to humans. The aneroid barometer is smaller than the mercury barometer. The aneroid barometer is more portable than the mercury barometer.

What are the two factors that affect air pressure?

Factors Affecting Air Pressure:

  • Temperature: As the temperature increases, air expands because of which its density decreases which results in low pressure. …
  • Height from Sea Level: …
  • Moisture in Air (Humidity): …
  • Gravitation of Earth: …
  • Rotation of Earth:

How does barometric pressure affect sea level?

Higher air pressure gives lower sea levels: an increase in air pressure of 1 hPa lowers the water level by 1 cm. … So high air pressure over a sea area corresponds to low sea level and conversely low air pressure (a depression) results in higher sea levels. This is called the inverse barometer effect.

Mercury Barometer Problems, Physics – Air Pressure, Height & Density Calculations – Fluid Statics

The history of the barometer (and how it works) – Asaf Bar-Yosef

Mercury Barometer

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