Problem Statement: In diving,
does 1. 100% Oxygen cause "The Bends" faster?
2. 60% Nitrogen, 40% Oxygen
3. 80% Nitrogen, 20% Oxygen
Method & Materials: Methods &
- twelve 2-liter soda bottles(must have clear outsides)
- 12 strater valves(compatible with oxygen tanks)
-12 liters of water
- a supply of pure nitrogen
- a supply of pure oxygen
- a supply of nitrox
- a supply of air
- a video camera
To set this lab up, we first have to pour 1 liter of water into
each soda bottle. That will make each body half-filled with water.
Unwanted air will still be in the bottle, so to remove all unwanted
gasses, we will squeeze the bottle and then put the cap on. This
will get rid of 14.7 psi of air in the bottle. Then we must hook
these bottles up through the schrader valve and inflate approximately
50 psi of pressure into each 2 liter bottle. We are going to
test three different types of gasses, and to insure that our
conclusion is not changed by an error, we will test each gas
three times. That makes nine 2-liter soda bottles. Dissolving
into a liquid is quite a slow process, so the longer the gasses
in the bottles have to dissolve, the more of a reaction will
been seen when opened. To measure which gasses "bubbled"
out more, we will use a video camera to film it and have a ranking
system from 1-10.
Hypothesis: Our lab group believes
that 100% Oxygen will cause "The Bends"
fastest. Not only is it the heaviest and largest molecule, it
is a pure
concentration. I believe O2 in pure concentration will cause
faster than N2 in pure concentration because oxygen molecules
are larger and heavier than Nitrogen molecules. This means they
have more trouble fitting in
and getting out of the crevasses between water molecules.
Trial 1 Trial 2 Trial 3
100% Oxygen: 10 9 3 (dis-credit
80% Nitrogen 20% Oxygen: 7 6 1 (discredit-leak) 6.5-Average
60% Nitrogen 40% Oxygen: 4 5 1 (discredit-leak) 4.5-Average
Discussion: Please See Analytic Essay
Conclusion: In conclusion, we found
that 100% oxygen causes "The Bends" fastest, then air,
and finally Nitrox. Using mathematics, we found that 100% O2
causes "The Bends" faster than pure nitrogen.