Q. Find the values of absolute pressure given that (a) Pressure gauge reading as 150 kPa, (b) Vacuum gauge reading as 40 hPa, when the atmospheric pressure is 101.3 kPa.

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.Q. Find the values of absolute pressure given that
(a) Pressure gauge reading as 150 kPa,
(b) Vacuum gauge reading as 40 hPa, when the atmospheric pressure is 101.3 kPa.

Given data:
Atmospheric pressure=101.3 kPa
Gauge pressure = 150kPa
Vacuum pressure = 40kPa

SOLUTION:
(a) Absolute Pressure = atmospheric pressure + gauge pressure

= 101.3 + 150 = 251.3kPa
(b) Absolute Pressure = atmospheric pressure – Vaccum pressure

= 101.3 – 40 = 61.3kPa

 

Q. Find the values of absolute pressure given that
(a) Pressure gauge reading as 200 kPa,
(b) Vacuum gauge reading as 60 hPa, when the atmospheric pressure is 102.3 kPa.

SOLUTION
(a) Absolute Pressure = atmospheric pressure + gauge pressure

= 102.3 + 200 = 302.3kPa
(b) Absolute Pressure = atmospheric pressure – Vaccum pressure

= 102.3 – 60 = 42.3kPa

DEFINITIONS

Absolute Pressure = atmospheric pressure + gauge pressure

Absolute Pressure = atmospheric pressure – Vaccum pressure

atmospheric pressure=Absolute Pressure + Vaccum pressure

atmospheric pressure=Absolute Pressure – gauge pressure

 

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