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There are a number of different gases for diving.
Most commonly, air is used for recreational diving. Sometimes, nitrox is used which is a higher proportion of oxygen. This is usually 30-35% oxygen instead of the ~20% in air. This has the benefit of less nitrogen so less "on-gassing". This increases the bottom time and reduces the decompression stops.
For commercial diving, there are a number of other gases used such as Trimix which I believe has Helium in it.
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How much does scuba gear weigh?
Different scuba gear types weigh different amounts. The oxygen tank is the heavy part of the scuba diving gear.
How can you fill a tank of compressed air without an air compresser?
You can use a scuba tank, but that is it.
What should scuba air smell like?
Compressed air used for SCUBA should smell like regular air. There may be a slight rubber smell from the regulator. When in doubt, it is safer to get your tank refilled than to dive on contaminated air.
A device that supplies air to under water swimmers?
scuba
What is the vest that you wear in scuba diving called and what is its purpose?
The vest is simply called a scuba vest. It's to hold your air tank and regulators :)
Which apparatus can you use to that water contains air?
Scuba Breathing Apparatus.
What is the scuba sign for no air?
Drawing your finger/hand across your throat.
What is the acceptable level of SCUBA AIR cylinder contamination?
one percent
How can a scuba diver suffer an air emoblism?
from holding their breath and ascending.
What is the air mixture in scuba?
Same as the air you breath everyday, aprox 21% Oxygen 79% Nitrogen
Are scuba tanks hydraulic or pneumatic?
SCUBA tanks are metal (usually steel or aluminum) that are filled with compressed air. This is loosely related to a pneumatic system.
Where can I buy a scuba diving watch?
You can buy scuba watch at scuba.com and leisurepro.com. They offer different kinds of watches and analog and water resistant scuba watch at a very reasonable prices.
