What factors determine the maximum length of a snorkel?

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Discussion Overview

The discussion centers on the factors that determine the maximum length of a snorkel, exploring aspects such as physical limitations, dead volume, and the effects of water pressure. Participants consider both theoretical and practical implications of snorkel length in relation to human physiology and diving equipment.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants suggest that chest muscle strength may limit snorkel length, questioning if stronger muscles could allow for deeper swimming with longer snorkels.
  • Others argue that dead volume is a critical factor, noting that longer snorkels contain more air, which can hinder effective breathing due to lack of air exchange.
  • Concerns are raised about water pressure at greater depths, with one participant questioning how scuba divers manage to breathe under pressure and whether their equipment compensates for this pressure.
  • It is noted that while dead volume limits practical snorkel lengths, pressure becomes a significant issue at greater depths, potentially leading to dangerous pressure differences in the lungs.
  • A participant references a physics textbook example, discussing the pressure differences associated with snorkel lengths and the potential dangers of collapsing lungs at certain depths, while acknowledging variability based on individual strength.

Areas of Agreement / Disagreement

Participants express differing views on the primary limitations of snorkel length, with some emphasizing muscle strength and others focusing on dead volume and pressure effects. The discussion remains unresolved regarding the most critical factors influencing snorkel length.

Contextual Notes

Limitations include assumptions about individual strength and the specific conditions under which the pressure differences are calculated. The discussion does not resolve how these factors interact in practical scenarios.

yasar1967
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What limits the length of a snorkel?
Our chest muscles strenth?
If they are strong enough will we be able to swim under 3m of water with a loong snorkel?
 
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You have to take a dead volume into account - the longer the snorkel, the more air it contains and you breath this air only, there is no exchange.
 
How about the water pressure we have to deal? Wouldn'T be much more diffucult to expand your chest at deeper sea levels? Then how scuba divers breath? Do their tubes give much more pressurised air to chest to overcome water pressure?
 
For practical lengths of snorkel they are limited by the dead volume but deeper than this you would have a problem with pressure.
The 'clever' part of a scuba rig is the regulator (the plastic thing in your mouth) this delivers air at exactly the surrounding water pressure.
 
yasar1967 said:
What limits the length of a snorkel?
Our chest muscles strenth?
If they are strong enough will we be able to swim under 3m of water with a loong snorkel?
Yes. I think the muscles are the most important factor. It's just a question of pressure difference between the air in a diver's lungs (at atmospheric level until he breathes out) and that on the body (due to the water).
An example from one of my physics textbooks uses a simple model of a diver in still, fresh water (density 1000kg/m^3). A snorkel length of 6m would lead to a pressure difference of about 60,000 Pa - more than enough to collapse the lungs and force pressurised blood into them, i.e., extremely dangerous. In this model, the pressure difference is directly proportional to the depth, and so, under the same conditions, a 3m snorkel would give a pressure difference of half of this. I'm not sure how dangerous this would be. Obviously it will vary somewhat depending on the strength of the person.
 

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