Who can explain Partial pressure to a Marine

[adam0321]

I teach for the MArines and have to teach PPo and law of absorbtion to a bunch of young marines. I know the laws but am having a hard time conveying it. ANy thought would be great and visual demonstrations.

[shy]

Tell them a bunch of marines, and soldiers are pushing on a truck. You get partial push (pressure) from the soldiers, and the rest from the marines.

[adam0321]

ha ha I would love to but I might loose my teaching quals

[shy]

Alright, then football players, and wrestlers.

[adam0321]

they get that the mixture of a gas is eual to the sum of its parts. But I need to relate that to the change in ppo at depth and how it relates to gas toxcicity

[OFG-1]

they get that the mixture of a gas is eual to the sum of its parts. But I need to relate that to the change in ppo at depth and how it relates to gas toxcicity

Well, let me give it a try

It is the difference between chugging a beer bong (at surface pressure) and filling the bong with Jose Quervo (at depth)
One is not too bad, the other a killer.
Even your run of the mill bootneck can relate to that.

[adam0321]

i need to explain it in depth such as gas toxcity increase into the body and surface area and volume and such

[adam0321]

tru but then I have them thinking about libo and not about diving. thank you though. I have come up with the idea of using a seal a meal in class to show them how a bag(lungs) filled with marshmellows(gas) is full on the surface but at depth becomes compressed and therfore alowing more room for more marshmellows. and how at surface the preasure the marshmellow exerts on the bags(lungs) is not that great but how at depth they are pushing harder on the bag therfore becoming absorbed into the tissues more rapidly. this way I cover boyles.henerys,and daltons law all at once.

I am having a hard time showing how 32% nitrox is .76ppo2 at 45' but 1.58ppo2 at 130'. so 32%on surface is like 132% at 100'(just an estimate not actualy doing the math) I can do the equation and show them but its hard to explain and visualize why it is

[RN]

tru but then I have them thinking about libo and not about diving. thank you though. I have come up with the idea of using a seal a meal in class to show them how a bag(lungs) filled with marshmellows(gas) is full on the surface but at depth becomes compressed and therfore alowing more room for more marshmellows. and how at surface the preasure the marshmellow exerts on the bags(lungs) is not that great but how at depth they are pushing harder on the bag therfore becoming absorbed into the tissues more rapidly. this way I cover boyles.henerys,and daltons law all at once.

I am having a hard time showing how 32% nitrox is .76ppo2 at 45' but 1.58ppo2 at 130'. so 32%on surface is like 132% at 100'(just an estimate not actualy doing the math) I can do the equation and show them but its hard to explain and visualize why it is

Great example. You can continue with it to explain your 32% nitrox increase. Skip the 45' and bring it to 33'. At the surface 32 marshmallows fill your bag. When you take those marshmallows to 33', they are half the size. But the bag is still the same size because it has more structure (muscles and ribs) to hold it open. But you still need to fill the entire space, so you must put another 32 marshmallows in there. At 99', you have to have 128 marshmallows in the bag to fill the same space. At 132' you have to have 160 marshmallows in the bag before it's full.

[mstueven]

Great example. You can continue with it to explain your 32% nitrox increase. Skip the 45' and bring it to 33'. At the surface 32 marshmallows fill your bag. When you take those marshmallows to 33', they are half the size. But the bag is still the same size because it has more structure (muscles and ribs) to hold it open. But you still need to fill the entire space, so you must put another 32 marshmallows in there. At 99', you have to have 128 marshmallows in the bag to fill the same space. At 132' you have to have 160 marshmallows in the bag before it's full.

And you could fill the bag with different "color" marshmellows to represent Oxygen, Nitrogen, and Helium, taking it into partial pressure as well...?