You use absolute pressure in fluid mechanics when you want to determine the force exerted by a fluid on a solid object. The absolute pressure is the pressure exerted by the fluid on the object, plus the atmospheric pressure.
Other related questions:
Q: Where do we use absolute pressure?
A: Absolute pressure is used in many different settings, including in weather reports, scuba diving, and in measuring atmospheric pressure.
Q: What is absolute pressure fluid mechanics?
A: The absolute pressure of a fluid is the pressure of the fluid relative to a perfect vacuum. In other words, it is the pressure of the fluid in a system where the atmospheric pressure is zero.
Q: Why do we measure absolute pressure?
A: Absolute pressure is a measure of the force per unit area exerted by a fluid on a surface.
Q: How do you know if pressure is absolute or gauge?
A: If the pressure is measured with respect to atmospheric pressure, it is said to be gauge pressure. If the pressure is measured with respect to a perfect vacuum, it is said to be absolute pressure.
Bibliography
- Introduction to Pressure in Fluid Mechanics
- Define gauge pressure and absolute … – Lumen Learning
- 11.6: Gauge Pressure, Absolute Pressure, and Pressure …
- When to use absolute or gauge pressure in computations
- College Physics chapters 1-17 – UH Pressbooks
- When to use absolute pressure or gauge pressure in fluid …