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Not sure what the standard way to describe this is, but seems to me that if the volume is 550 cubic inches or 0.31 cubic feet, then by definition it always holds 0.31 cubic feet of compressed air (though that's not very meaningful because pressure is not specifiied), but more specifically it can...

The specific question comes from paintball, which is the reason for the smaller 13 cubic inch tank, but I figured that the math behind it relates equally well to scuba :) I think I discovered the source of my confusion. The manufacturer of the 97 cf tank says "97 cubic ft (or 550 cubic...

Okay, that's the same as what I did above. My exact calculation above was 0.33*145.5 = 48 cu-ft, basically the same as your approx Looks like you got the units mixed up here. The pony is 13 cubic-inches. Also not sure why you took 1/3 of 19. I calculated 19.5 as the volume of space that...

It's volume. the same air takes up a greater volume when you reduce the pressure from 4500 to 3000 psi. P1*V1 = P2*V2 4500*97 = 3000*V2 V2 = 97*3000/4500 = 145.5 cf

EDIT: the question has been solved. The confusion below arises from the fact that it's not actually a 97 cf tank, it's a 550 cubic inch tank (that could hold up to 97 cubic feet of uncompressed air) Suppose I have a 97 cf tank at 4500 psi, and a 13 ci tank at 3000 psi. Every time the little...

So by your logic, we should also ditch safety stops because DCS is a low probability and safety stops are not proven to be 100 percent effective

Moving from Vermont, and my girlfriend will be joining me. I have done about 50 ocean dives, but she has never dived before so the first step will be getting her certified. Since we're going to be there for some time and staying close to the beach, we are hoping to get into shore diving too

That's correct, I try to research risk mitigation strategies before they are needed! Isn't that the point?

I've never dove in water that had high frequency of shark attacks before, but I'm moving to hawaii where and plan to go diving in waters with a high shark population on a frequent basis, so I'm looking into ways that I can reduce my risk to counterbalance the increased exposure

Technically, you only need enough lead to ensure that your body is neutrally buoyant when your tank is nearly empty. Almost all humans (regardless of weight) are neutrally buoyant in their birthday suits, which means that you are about 5 lbs negative when fully exhaled and 5 pounds positive...

There are many dangers to worry about when scuba diving. Pulmonary embolism, decompression sickness, nitrogen narcosis, drowning, being taken by current, etc are all statistically much more likely to occur on a pure population basis...but all of those risks are under the direct control of the...

When a dog bites, it's usually provoked. When a shark bites, it's always unprovoked. When a dog bites, it usually leaves a small scar. When a shark bites, it usually results in amputation of a limb. Dogs don't consider humans a potential source of food. Sharks sometimes do. Most dogs weigh...

Oh cool, thanks for finding this! I like the DIY approach. Thinking about giving this a try with some fabric paint myself!

Shark attacks do happen, most are not fatal but are still life changing and terrible. Ifa simple paint job on my wetsuit can have a statistically significant reduction in chances of that happening to me, it's a no brainier. People can ridicule me for thinking about safety of a less likely...

True. I reached out to the researcher who was supposedly doing their testing, perhaps he can inform me if the reason the wetsuit was scrapped was based on trails that didn't work or if there was any better evidence.

Incidents List In 2019 there were 13 shark attacks, 10 of which the activity was swimming with no surfboard/paddle board to be accidentally confused with. That's a lot more than your 1 per year estimate. Sharks in Hawaii - The Good, Bad, and Ugly - Living in Hawaii - Moving to Oahu, Maui...

Technically you don't need a dive computer, a backup second stage, or a SPG in order to dive...but these things reduce the chances of accidents happening. Suit coloration can affect the chances of accidents happening too. 1) if your suit is not visible to dive buddies in low light conditions...

Ah, good to know. Thanks for the better chart!

Hmm..really? I was thinking that the 3mm would be overboard according to this guide: How to Choose a Wetsuit & Temperature & Thickness Chart | evo

I was living in Boston and often diving every weekend. At the beginning the pandemic, I sold my house and moved into the country, so I haven't been able to dive for a long time. However I'm moving to Hawaii this winter looking forward and looking forward to some socially distanced reef and...