SCUBA tanks hold filtered and pressurized air. While SCUBA tanks are often referred to as oxygen tanks, they typically contain only about 21 percent oxygen.
SCUBA tank parts include mouth pieces, valves and gauges that allow the diver to keep track of how much air is left in the tank.
The amount of time a SCUBA tank lasts depends on an individual's breathing rate, water depth and tank size. Experienced divers often make tanks last for an hour or longer.
SCUBA tanks are typically made from aluminum or steel alloys. The cheaper aluminum tanks become buoyant as the divers use up the air, while the more expensive steel tanks don't affect a diver's buoyancy.
SCUBA tank size is determined by the amount of air it holds in pressurized cubic feet. Tanks range in size from 25 cubic feet of air up to 150 cubic feet, but the average size is 80 cubic feet.
Tanks should be inspected yearly by trained technicians. The SCUBA diving industry also requires hydrostatic testing every five years.
Article Written By Cat Carson
Cat Carson has been a writer, editor and researcher for more than 10 years. She has professional experience in a variety of media, including the Internet, newspapers, newsletters and magazines. Her work has appeared on various websites. Carson holds master’s degrees in both writing and cultural anthropology, and is currently working toward her doctorate degree.