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Review of Physics

This review covers fundamental physics concepts relevant to diving, focusing on pressure calculations, partial pressure of gases, and the interpretation of ppO2 and ppN2 values for various EAN mixes. It includes practical applications such as calculating the maximum operating depth (MOD) and equivalent air depth (EAD) for specific gas mixtures. The review provides examples and formula derivations to assist divers in determining safe diving parameters, thereby enhancing their understanding of dive planning and safety protocols.

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Review of Physics

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  1. Review of Physics

  2. Physics - Introduction • Pressure T • Calculate • ppO2 at any given depth • MOD • Required EAN% • Equivalent Air Depth • Calculations

  3. ppg Fg P Pressure T ppg = Fg x P Fg = ppg/P P = ppg/Fg ppg – Partial Pressure of a gas Fg – Fraction of gas P - Absolute Pressure

  4. Pressure T Calculations What is the ppO2 of EAN 34 at 28 metres? ppO2 = FO2 x P = 0.34 x 3.8 = 1.292 bar Can calculate ppO2 at any given depth

  5. Pressure T Calculations What is the ppN2 of EAN 34 at 28 metres? ppg = Fg x P FN2 = 1 – 0.34 = 0.66 P = 3.8 Bar ppN2 = 0.66 x 3.8 Bar = 2.508 Bar

  6. Pressure T Calculations At what depth does EAN 50 have a ppO2 of 1.6 bar? P = ppg/Fg = 1.6/0.5 = 3.2 Bar = 22 metres Allows Calculation of Depth Limit for a given EAN mix

  7. Pressure T Calculations What Nitrox mix will we use to give a ppO2 of 1.6 at 10m? ppO2 = 1.6 bar P = 2 Bar FO2 = ? FO2 = ppO2/P = 1.6/2 = 0.8 Answer: EAN 80 Allows Calculation of EAN mix to use

  8. Equivalent Air Depth (EAD) • ppN2 of Nitrox = ppN2 of Air at shallower depth • Air Tables • Calculate EAD using Pressure T

  9. Equivalent Air Depth (EAD) What is the EAD of EAN 35 at 30 metres? P = 4 Bar FN2 = 1 – 0.35 = 0.65 ppN2 = ? ppN2 = P x FN2 = 4 x 0.65 = 2.6 bar At what depth is ppN2 of Air = 2.6 bar?

  10. Equivalent Air Depth (EAD) ppN2 = 2.6 bar FN2 = 0.79 P = ? P = ppN2/FN2 = 2.6/0.79 = 3.29 Bar = 22.9 metres (23 metres) For EAN 35 at 30m, can use Air Tables at 23m

  11. Physics Summary • Pressure T • Calculate • ppO2 at any given depth • MOD • Required EAN% • Equivalent Air Depth • Calculations

  12. Questions?

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