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

AI Thread Summary
Absolute pressure is defined as the total pressure exerted on a system, including atmospheric pressure, while gauge pressure measures pressure relative to atmospheric pressure. The relationship between absolute pressure and gauge pressure is linear, meaning that gauge pressure can be calculated by subtracting atmospheric pressure from absolute pressure. The surface pressure in a pool is not zero; it is influenced by the weight of the water above it. Understanding these concepts is crucial for accurate pressure measurements in various applications. The discussion emphasizes the importance of distinguishing between absolute and gauge pressure in practical scenarios.
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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.
 
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Is the surface pressure zero?
 
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