whats the diff b/w zero pressure and obsolute pressure

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whats the diff b/w zero pressure and obsolute pressure..

Answer / welcome4ujd

In order to understand various types of pressure the
following will be considered: Pressure Scale reference
points, there are two reference points, the zero point of
pressure which is assumed to a perfect vacuum, another
point is atmospheric pressure which varies with altitude
above sea level and with weather conditions.
Absolute pressure scale starts from a zero reference point
representing the full vacuum and extends through
atmospheric pressure to the highest limit of measurable
pressure.
Gauge pressure scale starts zero reference point
representing the local atmospheric pressure and extends to
a chosen limit applicable to the specific process system.
Vacuum scale starts from the absolute zero reference point
and extends to a maximum represented by atmospheric
pressure.
The above can be expressed as following:
Zero of absolute pressure = perfect vacuum
Absolute Pressure = Pressure above Absolute zero
Gauge Pressure = Absolute Pressure – Atmospheric pressure
Vacuum gauge Pressure = Atmospheric Pressure – Fluid
Pressure

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whats the diff b/w zero pressure and obsolute pressure..

Answer / mani

Absolute pressure = Gauge pressure + Atmospheric
pressure

Is This Answer Correct ?

6 Yes

1 No

whats the diff b/w zero pressure and obsolute pressure..

Answer / www.islamqa.com

# P(absolute)=P(atmospheric)+P(gauge)
if P(gauge)> P(atmospheric)

# P(absolute)=P(atmospheric)-P(gauge)
if P(gauge)< P(atmospheric)

Regards,

Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
ahmedsabry.online@gmail.com
CELL.: 00 2 0121367310

Is This Answer Correct ?

1 Yes

1 No

whats the diff b/w zero pressure and obsolute pressure..

Answer / rajesh j

Atmospheric pressure is the pressure surrounding us which
is 1.013bar.
Generally pressure gauges or transmitters show Atmospheric
pressure+Absolute pressure, which is called as Gauge
pressure

So, Absolute pressure = Gauge pressure - Atmospheric
pressure

Is This Answer Correct ?

8 Yes

18 No

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