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Normal atmospheric pressure is enough to support a column of mercury approximately?
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∙ 9y ago
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Why is the value of atmospheric pressure compared to mercury?
Atmospheric pressure will support a column of mercury to about 760 mm. Mercurial air pressure is described as '760 mmHg'. As air pressure changes , the height of this column will also change. If you did it with water, the column would have to be about 34 feet (10.2 metres) in height.
How do submersible pumps work?
While it's easy to push on water, it's hard to pull on water. When you drink soda through a straw, you may feel like you're pulling on the water, but you're not. What you are actually doing is removing some air from the space inside the straw and above the water, so that the air pressure in that space drops below atmospheric pressure. The water column near the bottom of the straw then experiences a pressure imbalance: the usual atmospheric pressure below it and less-than-atmospheric pressure above it. That imbalance provides a modest upward force on the water column and pushes it up into your mouth. So far, so good. But if you make that straw longer, you'll need to suck harder. That's because as the column of water gets taller, it gets heavier. It needs a more severe pressure imbalance to push it upward and support it. By the time the straw and water column get to be about 40 feet tall, you'll need to suck every bit of air out from inside the straw because the pressure imbalance needed to support a 40-foot column of water is approximately one atmosphere of pressure. If the straw is taller than 40 feet, you're simply out of luck. Even if you remove all the air from within the straw, the atmospheric pressure of the water below the straw won't be able to push the water up the straw higher than about 40 feet. To get the water to rise higher in the straw, you'll need to install a pump at the bottom, or a submersible pump. The pump increases the water pressure there to more than 1 atmosphere, so that there is a bigger pressure imbalance available and therefore the possibility of supporting a taller column of water. The submersible pump can boost the water pressure well above atmospheric and thereby push the water to the surface despite the great height and weight of the water column. Multiple stage submersible pumps are arranged in series so that the discharge from the first stage becomes the intake for the next stage with each successive stage adding its pressure to the previous one. Surface suction pumps are really only practical for water that's a few feet below the surface; after that, deep pressure pumps are a much better idea.
How do Submersibles work?
While it's easy to push on water, it's hard to pull on water. When you drink soda through a straw, you may feel like you're pulling on the water, but you're not. What you are actually doing is removing some air from the space inside the straw and above the water, so that the air pressure in that space drops below atmospheric pressure. The water column near the bottom of the straw then experiences a pressure imbalance: the usual atmospheric pressure below it and less-than-atmospheric pressure above it. That imbalance provides a modest upward force on the water column and pushes it up into your mouth. So far, so good. But if you make that straw longer, you'll need to suck harder. That's because as the column of water gets taller, it gets heavier. It needs a more severe pressure imbalance to push it upward and support it. By the time the straw and water column get to be about 40 feet tall, you'll need to suck every bit of air out from inside the straw because the pressure imbalance needed to support a 40-foot column of water is approximately one atmosphere of pressure. If the straw is taller than 40 feet, you're simply out of luck. Even if you remove all the air from within the straw, the atmospheric pressure of the water below the straw won't be able to push the water up the straw higher than about 40 feet. To get the water to rise higher in the straw, you'll need to install a pump at the bottom, or a submersible pump. The pump increases the water pressure there to more than 1 atmosphere, so that there is a bigger pressure imbalance available and therefore the possibility of supporting a taller column of water. The submersible pump can boost the water pressure well above atmospheric and thereby push the water to the surface despite the great height and weight of the water column. Multiple stage submersible pumps are arranged in series so that the discharge from the first stage becomes the intake for the next stage with each successive stage adding its pressure to the previous one. Surface suction pumps are really only practical for water that's a few feet below the surface; after that, deep pressure pumps are a much better idea.
How high a column of water will a water pressure of 60psi support?
172.3 feet
Why discharge tube appears dark at very low pressure?
Not enough gas to support ionization.
What does Hg stand for in the metric system?
Nothing.Hg is the chemical symbol for Mercury and, under the old system, atmospheric pressure was measured in terms of the height of a column of mercury that it could support. In the SI systems this has been replaced by pressure measured in Pascals. Standard atmospheric pressure is 101325 Pa.
Why is the value of atmospheric pressure compared to mercury?
Atmospheric pressure will support a column of mercury to about 760 mm. Mercurial air pressure is described as '760 mmHg'. As air pressure changes , the height of this column will also change. If you did it with water, the column would have to be about 34 feet (10.2 metres) in height.
Why was mercury chose for a job in barometres?
Pressure in these things is measured by how tall a column of liquid it can support. Now atmospheric pressure can support many feet of oil, for example, and who wants a barmeter that tall? Mercury is very dense so you can get away with less than a metre high. Problem solved.
Are there liquids on Mars?
No, it doesn't have enough atmospheric pressure to support liquids.
What is the Atmospheric pressure on Pluto?
Almost zero. Pluto has very little gravity and cannot support much of an environment. In its summer, it can get up to 0.3 Pascals of atmospheric pressure, about 338,000 times less pressure than on Earth.
Why is mercury used in barometers instead of water?
Because it has a high density... meaning that the volume increase or decrease due to altitude change is can be viewed in a practical sized barometer. If water, which had a much lower density, was used instead of mercury, the barometer must be at least 15m high.
Why will a vacuum pump not work in a well that is more than 10 m deep?
The water is pumped upwards by the atmospheric pressure acting on the surface of the water in the well. That is only strong enough to support a column of water that is 10m tall.The water is pumped upwards by the atmospheric pressure acting on the surface of the water in the well. That is only strong enough to support a column of water that is 10m tall.The water is pumped upwards by the atmospheric pressure acting on the surface of the water in the well. That is only strong enough to support a column of water that is 10m tall.The water is pumped upwards by the atmospheric pressure acting on the surface of the water in the well. That is only strong enough to support a column of water that is 10m tall.
A gas occupies 30 L at 760 mm Hg what is its volume at 350 mm Hg?
The phrase "760 mm Hg" is physicists' shorthand for "an atmospheric pressure equal to that needed to support a column of mercury [chemical symbol Hg] of length 760 mm". This is approximately average atmospheric pressure at sea level. As the pressure decreases from "760 mm Hg" to "350 mm Hg", the volume of the gas will increase (assuming a constant temperature). The new volume can be determined using Boyle's Law: New Volume = 30 x 760 / 350 = 65.143 Litres
What does mm Hg mean for compression stockings?
"mm Hg" stands for millimetres of mercury. Atmospheric pressure was measured in terms of the height of a column of mercury that it could support and by extension, mm Hg became a unit for measuring pressure.
Why does the Earth support life so well?
The honest answer is "just lucky", but temperature and atmospheric pressure such that water can exist in liquid form is critical.
What happens if you use water instead of mercury in determination of atmospheric pressure?
I'm not sure if this answer is the kind of answer you're looking for, but basically, you would have to use a much larger amount of water than mercury to get an accurate reading of atmospheric pressure. This is because water is not nearly as dense as mercury, so it takes much less atmospheric pressure to raise the water up the tube in a water barometer. This results in water rising much more easily than mercury. Obviously, then, a water barometer would have to be much larger than a mercury one. Since mercury is more dense than water, mercury barometers are much smaller. So, if you put water in a mercury barometer instead of mercury, the reading you get would be way too high.Air pressure at sea level is about 14.7 pounds per square inch (psi) and can push a column of water almost 33 feet high, but it can only push mercury 30 inches high. Roughly, ever inch of mercury equals a foot of water.
What is the answer of...Air particles pressing down on a surface?
Air pressure. At sea level it is approximately 760 mmHg. I say approximately because air pressure naturally changes between high pressure areas(anticyclones) and low pressure areas (depressions/cyclones/hurricanes/typhoons). NB 760 mmHg means that the air pressure will support a column of mercury(Hg - hydragyrum) of approximate height 760 mm (millimetres) ( 0.76 metres). Sometimes air pressure is measured in 'pounds per square inches' or 'pascals'.
