What is vacuum gauge pressure?

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โˆ™ 2010-08-31 15:46:10

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Gauge pressure usually refers to the pressure difference between ambient, atmospheric pressure and the pressure in a vessel or line. A gauge pressure of zero would mean that the vessel or line was at atmospheric pressure. Normally the pressures of interest are ABOVE atmospheric so the gauge pressure is positive. Vacuum gauge pressure measures how far BELOW atmospheric pressure a vessel or line is. As such vacuum gauge pressure may be measured as a negative number - or for convenience it may be reported as a positive number with the caveat that it is "vacuum gauge pressure", meaning that the reported pressure is how far atmospheric pressure is above the pressure in the vessel or line.

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Q: What is vacuum gauge pressure?
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Related questions

What gauge measures both vacuum and pressure?

Differential Pressure Gauge

What type of pressure gauge can measure vacuum pressure?

A Bourdon Tube or a Bellows gauge

What instrument measures absolute pressure?

vacuum pressure gauge

How is vacuum pressure read?

You need a vacuum gauge and it is reed in inches.

How do you calibrate compound gauges?

using master vacuum gauge and master pressure gauge

What is -14.7 psig?

-14.7psig is the gauge pressure of an absolute vacuum.

What is ment by absolute pressure?

It's is the pressure measure from 0 pressure, or a vacuum. Whereas gauge pressure is measured from atmospheric pressure. To find absolute pressure, take the gauge pressure and add the atmospheric pressure (about 101.325 KPa ) to it.

Difference between Absolute and gauge pressure?

Absolute pressure = gauge pressure + atmospheric pressureWhen using a pressure gauge, like when measuring the pressure of the air in a tire, the gauge is actually reading the difference between the atmospheric pressure and the atmospheric pressure. So if the gauge measures 30 psi, and taking atmospheric pressure at about 14.7 psi, the absolute pressure in the tire is actually about 44.7 psi. If the tire is flat, then the gauge will read zero psi, but there is not a vacuum - there is still some air present in the tire, and the absolute pressure of this air is the same as the atmospheric pressure (about 14.7 psi).See related link: Guide to the Measurement of Pressure and Vacuum.

What is high-side gauge definition?

On a manifold gauge set, there are two gauges. The gauge encased in red measures pressure on the high pressure (discharge) side. That's the "high side gauge". The other will be incased in blue, and measures vacuum pressure on the low side.

Advantage of bourdon pressure gauge?

Bourdon tube can be used to measure even vacuum pressures, that are lower than atmospheric pressure...

What is the absolute pressure scale?

absolute pressure is calculated from a vacuum (0 psi) and atmospheric pressure is14.7psia or 14.7 psi above a vacuum 1psi on a tire pressure gauge is called 1psig = 15.7psia 10psig=24.7psia 100psig=114.7psia etc.

What is a pirani gauge?

The Pirani gauge is a robust thermal conductivity gauge used for the measurement of the pressures in vacuum systems. This gauge is used to measure the pressure between 0.5 torr to 10-4 torr.

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