What is Absolute Pressure and How is it Related to Gauge Pressure in a Pool?

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SUMMARY

This discussion centers on the relationship between absolute pressure and gauge pressure in the context of a pool. It is established that gauge pressure is directly related to absolute pressure through a linear equation. The conversation also touches on the definition of absolute pressure, emphasizing that it is measured relative to a perfect vacuum, while gauge pressure is measured relative to atmospheric pressure. The conclusion drawn is that the surface pressure in a pool is not zero, as it is influenced by the weight of the water above it.

PREREQUISITES
  • Understanding of basic fluid mechanics concepts
  • Familiarity with pressure measurement units (e.g., Pascals, atmospheres)
  • Knowledge of linear equations and their applications
  • Basic principles of hydrostatics
NEXT STEPS
  • Research the differences between absolute pressure and gauge pressure
  • Study the hydrostatic pressure equation and its applications
  • Learn about pressure measurement techniques in fluid systems
  • Explore real-world applications of pressure concepts in engineering
USEFUL FOR

Students in physics or engineering, pool maintenance professionals, and anyone interested in fluid dynamics and pressure measurement principles.

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Homework Statement
You are originally 2.0m below the surface of a pool.

If you swim to 4.0m below the surface, what will happen to the absolute pressure on you?

a) Absolute Pressure Quadruples
b) Absolute Pressure More than doubles
c) Absolute Pressure exactly doubles
d) Absolute Pressure less than doubles
Relevant Equations
P gauge = ρgh
P total = P atm + P gauge
I think I can eliminate A because the equations depict a linear relationship. Since the gauge pressure is in a linear relationship with the absolute pressure, I would say exactly 2, but the answer is d.
 
Physics news on Phys.org
Is the surface pressure zero?
 
How would you define absolute pressure? (In your own words.)
 

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