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All gasses heat on compression, and cool on expansion during a reversible process. The permanent change you refer to is known as the Joule Thompson effect. This is a change in the heat capacity of the gas as it changes pressure, and it is insignificant over relatively small pressure changes...

I will be in Sao Paulo on business over a weekend in March. Can anyone direct me to good dive op?

I'm calling troll on this one.

If your mask is of sufficient quality, and properly prepared, you can breath out your nose the whole dive without fogging it. A few things you can do. Use toothpaste to remove any residue from the manufacturing process. Do this several times. Alternatively you can remove the lenses and...

The term "water column" comes from the way water pressure is described in physics and engineering. A vertical column is used as a model to calculate the pressure at any given point, and show that pressure is a function of depth independant of the volume of water. When you talk about your...

One thing to note is that the fast majority of free flows are caused by the first stage. Knowing this, you should never use your octo in a free flow. If you do, and it is the first stage, you will have two free flowing seconds instead of one. If you are my buddy, within seconds of me...

Why does it matter if your head goes under?

If you empty to 500 psi, and fill to 3000 psi, your O2 will be less than 25 percent if you started with 40% nitrox. Don't exceed 40m with that and you will never even come close to your mod. For recreational purposes, and for recreational depths, you can treat a topped up Nitrox tank as air if...

If a mask that is not made from tempered glass has an increased risk of causing injury due to shattering, I fail to see how it would be suited to snorkeling, and not diving. In both activities, the risk of injury is the same for this particular cause. Should not all masks be made from tempered...

I am agreement here, and wanted to add a little bit. If your only reason for diving is because someone else wants you to, or because you want to overcome a fear, quit now. Diving requires that you will be in control of yourself at all times. Most good experienced divers will tell you that if...

I suppose you could always adjust your sea level SAC by multiplying by 0.832, and using that in your planning, if, other than the altitude, the dive was under exactly the same conditions as your sea level dives. However, given that your SAC is bound to be different, you are probably going to...

Please show me a single case. Just one, where somebody didn't blow up their lungs, and didn't recover from passing out due to breathing an inert gas when fresh air was readily available after they passed out. You say there are a "handful" of cases, but I can't seem to find any. In diving, we...

Well I did learn a little bit from this thread, especially after digging around a doing some research. While helium is unlikely to cause anything more than unconciousness if normal air is available after losing consiousness, there are other more serious considerations. Breathing off any...

This person wouldn't have been saved by adding oxygen to the helium. She died when the high pressure from the cylinder blew her lungs out. Again, not suggesting that people do this.

I would say that you should take the nitrox course when one of two things ocurrs: 1. Your bottom time starts being limited by your NDL instead of your air consumption. OR 2. You get a really good deal on the course. My course cost the same as anywhere else, but involved two charter dives. I...

Dive dive dive. There are so many things you can teach yourself just by diving and practising. Wreck diving, for instance, does not need to involve penetration to be fun. Formal training is not required as long as you are familiar with the hazards of diving the outside a wreck,most of...

I was refering to balloons that still have enough volume to float if they were filled with helium, but they sink. The helium has leaked out leaving the oxygen and nitrogen behind. ---------- Post Merged at 06:45 AM ---------- Previous Post was at 06:38 AM ---------- Yes, somebody could...

Sorry wrong term. I meant to say diaphram retaining ring.

One more question. In my zeal to check this thing out, I acidentally broke off one of the little retaining clips on the orifice retaining ring. Will this hurt or are these just to hold it in place until the cover is on? I was thinking that since I will be spending postage to get the new seat...

Can the seat be replaced on this one? Is it the same as the seat in the S-Wing poppet? Is the o-ring the same as one of the two o-rings in the s-wing poppet?