Absolute pressure question

In summary, the conversation is about determining the absolute pressure at a certain depth in water based on the change in radius of an air bubble. The temperature of the air in the bubble is assumed to remain constant and the acceleration of gravity is given. The equation used to solve for the pressure is P1V1=P2V2. There is also a follow-up question about determining the depth of the diver.
  • #1
J0hnnyD
4
0
Problem:

An air bubble originating froman under water
diver has a radius of 5 mm at some depth h.
When the bubble reaches the surface of the
water, it has a radius of 7.4 mm.
Assuming the temperature of the air in the
bubble remains constant, determine the abso-
lute pressure at this depth h. The acceleration
of gravity is 9.8 m/s2 .
Answer in units of Pa.

Homework Equations


what I need to know. Is this a PV=nRT question??


The Attempt at a Solution



I don't need to know the answer to the question, just what equation to use to find the absolute pressure. there is a follow up question to determine the depth of the diver as well.
 
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  • #2
I simplified it to P1V1=P2V2 and solved for P1 and got the answer. Anyone know how to find the depth of the diver given all these variables?
 
  • #3
Hi J0hnnyD, welcome to PF. Do you know how to find the hydrostatic pressure at a certain depth in a fluid?
 

1. What is absolute pressure?

Absolute pressure is the total pressure at a particular point in a fluid, including both atmospheric pressure and pressure due to the weight of the fluid above that point.

2. How is absolute pressure different from gauge pressure?

Gauge pressure is the pressure measured relative to atmospheric pressure, while absolute pressure includes atmospheric pressure in its measurement.

3. What units are used to measure absolute pressure?

Absolute pressure is typically measured in units of Pascals (Pa) or pounds per square inch (psi).

4. How is absolute pressure measured?

Absolute pressure can be measured using a variety of instruments such as barometers, manometers, or pressure transducers.

5. What are some real-world applications of absolute pressure?

Absolute pressure is important in many fields, including meteorology, aviation, and engineering. It is used to measure and monitor air and fluid pressure in various systems and processes.

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