SCUBA Diving, Urban Legends and Mythbusters

[I Dive]

PADI has a top secret plan to take over the world with an army of OW instructors. That's the main reason behind them developing their E-learning program.

 

[Blackwood]

Does the air pressure on the INSIDE of a scuba tank increase as the diver ascends?

No, it decreases.

And I'm not being a jackass. Even if you hang a tank from a rope with the valve shut, the pressure will increase as you lower it and increase as you hoist it up.

A scuba cylinder isn't perfectly rigid. As the ambient pressure increases, so does the force compressing the cylinder, which reduces (ever so-slightly) the internal volume. Not much, mind you, but technically speaking...

 

[Cave Diver]

Nitrox make you feel less tired.

The pee will rinse out of your wetsuit.

Those two are good.

 

[Tom Smedley]

To prove that you would have to measure it with a micrometer, mark it with chalk, and cut it with an axe.

No, it decreases.

And I'm not being a jackass. Even if you hang a tank from a rope with the valve shut, the pressure will increase as you lower it and increase as you hoist it up.

A scuba cylinder isn't perfectly rigid. As the ambient pressure increases, so does the force compressing the cylinder, which reduces (ever so-slightly) the internal volume. Not much, mind you, but technically speaking...

 

[Lead_carrier]

Originally Posted by Paladin954
Actually, you lose 60% of your body heat through your head!

Well truth is actually less then 10%.

Actually, according to which study you want to believe, it can have a very wide range.

Heat Loss Through the Head and Hypothermia Wilderness Medicine Newsletter

Re: How much heat is loss thru head?

Heat Losses From the Human Head -- Froese and Burton 10 (2): 235 -- Journal of Applied Physiology

It's keeps going and going and going.

 

[jeffloughridge]

Even if you hang a tank from a rope with the valve shut, the pressure will increase as you lower it and increase as you hoist it up.

Sounds like you have the secret to a perpetual dive machine.

 

[mike_s]

and the one you hear from overpriced LDS's the most...

If you buy it in the internet it's fake or not from an authorized dealer. Remember IT'S LIFE SUPPORT EQUIPMENT​

 

[iztok]

Actually, according to which study you want to believe, it can have a very wide range.

Heat Loss Through the Head and Hypothermia Wilderness Medicine Newsletter

Re: How much heat is loss thru head?

Heat Losses From the Human Head -- Froese and Burton 10 (2): 235 -- Journal of Applied Physiology

It's keeps going and going and going.

Not really. All have rather low percentage compared to the myth.

 

[Blackwood]

To prove that you would have to measure it with a micrometer, mark it with chalk, and cut it with an axe.

(Or measure with a strain gauge)

 

[Kevrumbo]

and the one you hear from overpriced LDS's the most...

If you buy it in the internet it's fake or not from an authorized dealer. Remember IT'S LIFE SUPPORT EQUIPMENT​

Well then . . .you'd better learn how to service/repair the gear yourself.