Free Diving: Lung Volume at Different Depths

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Discussion Overview

The discussion revolves around the changes in lung volume of a free diver at various depths underwater, specifically analyzing the effects of pressure on gas volume using gas laws. The context includes theoretical applications of physics principles related to fluid dynamics and gas behavior under pressure.

Discussion Character

  • Exploratory, Technical explanation, Homework-related

Main Points Raised

  • One participant states the initial lung volume at the surface is 5L and poses a question about its volume at depths of 5, 10, 20, and 100 meters.
  • Another participant requests a quick response, indicating urgency for the answer.
  • A third participant mentions the relationship between water pressure and depth, referencing the formula P = ρgh, and suggests using the ideal gas law (PV = nRT) to solve for volume.
  • A later reply emphasizes that answers are not provided directly and asks if the original poster is familiar with the applicable gas laws.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, as there is a mix of inquiries, requests for information, and clarifications about the application of gas laws without a definitive answer being provided.

Contextual Notes

The discussion does not clarify which specific gas laws may apply or how to approach the calculations, leaving assumptions and mathematical steps unresolved.

Who May Find This Useful

This discussion may be useful for students or individuals interested in the physics of diving, gas laws, and the effects of pressure on gas volume in a fluid environment.

p.mcnamara
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A free diver gets ready to dive into the water. She fills her lungs to capacity (5L) at the surface (normal atmospheric pressure≈105Pa)She then jumps into the water. Assuming no exchange of gas with the blood vessels, what will be her lung volume at 5, 10, 20, and 100 meters?
 
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I need this answer within a half an hour
 
Water pressure as below the water surface P = [itex]\rho[/itex]g h

ideal gas law PV = nRT or a variation of it.

solve for V
 
We do not hand out answers here. Do you know which of the gas laws apply?
 

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