Mechanical Engineering - Thermodynamics - Discussion

Discussion Forum : Thermodynamics - Section 1 (Q.No. 28)
28.
Which of the following is correct?
Absolute pressure = Gauge pressure + Atmospheric pressure
Gauge pressure = Absolute pressure + Atmospheric pressure
Atmospheric pressure = Absolute pressure + Gauge pressure
Absolute pressure = Gauge pressure - Atmospheric pressure
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
6 comments Page 1 of 1.

Prasanajit Das said:   4 years ago
Absolute pressure = Gauge pressure + Atmospheric pressure.

Manoj said:   5 years ago
Here Pab = Pgauge + Patm.

Deepak said:   8 years ago
A and C both are the correct answer.

If we measure absolute pressure above the atmospheric then option A.
and below the atmospheric pressure then C.

Hamid iqbal said:   8 years ago
Absolute pressure is zero reference against a perfect vacuum so it is = Gauge pressure + atmospheric pressure.

Similarly the Gauge pressure is zero reference against a atmospheric pressure.

DHMS said:   1 decade ago
Gauge pressure = Absolute pressure - Atmospheric pressure.

From this we get answer.

Hemanth said:   1 decade ago
The fluid in the gauge exerts a pressure in opposite direction which is atm pressure.

That's why the gauge pressure shown is less than the absolute pressure.

That diff is atm pressure.

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