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Why is the value of atmospheric pressure compared to mercury?
Amey01
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.
lenpollock
Wiki User
∙ 15y agoThe common method to measure atmospheric pressure employs an inverted column submerged in a fluid to determine the level at which the column has to be raised to equalize the external atmospheric pressure and the internal column pressure. The height at which the fluid inside the column ceases to increase is correlated to atmospheric pressure. Due to mercury's high density, this level is on the order of inches (~30 inches of mercury at atmospheric pressure). If water were to be used the column would have to be ~32 feet tall in order to develop the equalized pressures between the column and atmosphere.
Wiki User
∙ 14y agoMinuscule, since Mercury doesn't have a substantial atmosphere.
Wiki User
∙ 13y agoThe surface pressure of mercury is very low, almost zero since it has no sustainable atmosphere due to it's size. It's almost a vacuum.
Wiki User
∙ 9y agoFor all intense Mercury doesn't have an atmosphere.
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If the absolute pressure of gas is?
Absolute pressure is simply the addition of the observed gage pressure plus the value of the local atmospheric pressure.
Why barometer points only to 76mmhg?
bacuse the experiment proved with the help of barometer..the value was 76mmhg.at wich the atmospheric presure and the pressure in vessel coincide...
Why would a balloon inside a bell jar inflate when pressure is decreased within the jar?
The balloon exists in a separate pressure system from the bell jar itself.As the balloon is open to the surrounding air, the pressure within the balloon is 1 atm (1 atmospheric unit of pressure = 105 Pa).When pressure is decreased within the jar, the pressure within the jar decreases to a value lower than 1 atm. Therefore, to counter the low pressure created in the jar, the atmospheric air moves into the balloon and pushes the balloon into the jar to attempt to equalize the pressure in the balloon and in the jar. Therefore the balloon inflates.
How many millibars are in an inch?
33.8637526 1 Bar is an arbitrary "standard atmospheric pressure" which is roughly 29 and a half inches of mercury. If you multiply the inches-of-mercury value by 33.8637526 you get the pressure in millibars
Why is mercury used in calibration of blaine permeability apparatus?
i think mercury has high value density and its density depend on temperature for small size volumes, it is suitable (little change of mercury volume result significant mass value & easy Measurable) saeedhoseini
The value of atmospheric pressure at Johannesburg?
85 kPa
What is the value of normal atmospheric pressure of oxygen?
The standard atmospheric pressure is the air pressure of 101325 pascals (Pa) or 101.325 kilopascals (kPa) (1013.25 millibars), exerted by a 760 millimeter (29.92 inches) column of mercury at sea level at a temperature of 0 degrees Celsius.
What is absolute pressure?
Absolute pressure is simply the addition of the observed gage pressure plus the value of the local atmospheric pressure.
What is the value of atmospheric pressure?
about 100,000 newton per metre square. =)
If the absolute pressure of gas is?
Absolute pressure is simply the addition of the observed gage pressure plus the value of the local atmospheric pressure.
Is that the value for absolute pressure will always be greater than for gauge pressure?
No. We need to know exactly what is meant by gage here. A piston tyre gauge measures pressures relative to atmospheric. A mercury barometer measures absolute pressure. A gauge that involves uncoiling of a coiled tube will measure absolute pressure (it will have to be calibrated). But a manometer which is open to the atmosphere on one arm will measure pressures relative to atmospheric pressure so the real pressure is the two added together.
What is 760 mm atmospheric pressure?
760 mm Hg is 1 atmosphere, so approx 1 bar. It is 1.013 bar, which is 1013 milibars.
What is the standard sea level pressure in millimeters of mercury?
Standard air pressure at sea level is 1 atmosphere, or 1 atm. This is the adopted standard atmosphere value, but sea level pressure will not always equal to this value due to changes in weather. 1 atm = 101 325 pascals = 1.01325 bars.
Is a line which represent continuous value on maps?
Isobar for atmospheric pressure, isotherm for temperature, or contour for height above (below) sea level.
Why do the lungs remain expanded in the normal thoracic?
A couple of reasons: surfactant - a detergent - reduces surface tension to a negative value. the plura contains a "vacume" (lower pressure than atmospheric) and pulls the lungs to the chest wall. venous blood partial gas pressure is sub atmospheric.
Why barometer points only to 76mmhg?
bacuse the experiment proved with the help of barometer..the value was 76mmhg.at wich the atmospheric presure and the pressure in vessel coincide...
Why is it necessary to subtract the value for water vapor preassure from atmospheric preassure to determine the preassure of H2 gas?
Because of the Dalton's Law. pressure total= pressure1+pressure2
