Is absolute pressure same as gauge pressure?

In summary, gauge pressure is the difference between the pressure measured in a fluid and atmospheric pressure, while absolute pressure is the total pressure at a point in a fluid, equaling the sum of gauge and atmospheric pressures. The equation for absolute pressure is Pabs = Pgauge + Patmos, where Patmos cancels out. The instruments used to measure pressure actually measure the pressure difference, with gauge pressure being the difference between measured pressure and atmospheric pressure, and absolute pressure being the difference between measured pressure and zero pressure or vacuum.
  • #1
avito009
184
4
From what I have read:

Gauge Pressure: The amount by which the pressure measured in a fluid exceeds that of the atmosphere.

and

Absolute pressure: Total pressure at a point in a fluid equaling the sum of the gauge and the atmospheric pressures.So Absolute pressure= Patm+ P-Patm= P (Which is pressure in a fluid). Atmospheric pressure cancels each other in the equation.
 
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  • #2
avito009 said:
So Absolute pressure= Patm+ P-Patm= P (Which is pressure in a fluid). Atmospheric pressure cancels each other in the equation.
Yes. So the answer to your question in the title is no.
 
  • #3
Why are you subtracting Patm from P? Pabs = Pgauge + Patmos.
 
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  • #4
Jobrag said:
Why are you subtracting Patm from P?
I support the question.
avito009, The instruments measures the pressure actually measured the pressure difference. The gauge pressure is the difference between measured pressure and atmosphere.pressure and the absolute one is the pressure difference between measured pressure and prussure of vacuum (zero).
 

Related to Is absolute pressure same as gauge pressure?

1. Is absolute pressure the same as gauge pressure?

No, absolute pressure and gauge pressure are two different measurements of pressure. Absolute pressure measures the total pressure exerted by a fluid, including atmospheric pressure, while gauge pressure only measures the pressure above atmospheric pressure.

2. What is the difference between absolute pressure and gauge pressure?

The main difference between absolute pressure and gauge pressure is that absolute pressure takes into account the atmospheric pressure, while gauge pressure does not. This means that absolute pressure values will always be higher than gauge pressure values.

3. Why are absolute pressure and gauge pressure important in scientific research?

Absolute pressure and gauge pressure are important in scientific research because they are used to make accurate measurements in various systems and processes. They help to determine the amount of force being exerted by a fluid, which is crucial in understanding and predicting the behavior of systems.

4. Can absolute pressure and gauge pressure be converted into each other?

Yes, absolute pressure and gauge pressure can be converted into each other using a simple formula. To convert from absolute pressure to gauge pressure, you subtract the atmospheric pressure from the absolute pressure. To convert from gauge pressure to absolute pressure, you add the atmospheric pressure to the gauge pressure.

5. How do I measure absolute pressure and gauge pressure?

Absolute pressure can be measured using instruments such as barometers or manometers, which measure the total pressure exerted by a fluid. Gauge pressure can be measured using instruments such as pressure gauges, which measure the pressure above atmospheric pressure. It is important to note that the units of measurement for absolute pressure and gauge pressure are different, with absolute pressure being measured in pascals (Pa) and gauge pressure being measured in pounds per square inch (psi) or kilopascals (kPa).

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