How does scuba work?

Self-contained underwater breathing apparatus (scuba) has been developed to enable man to swim and stay underwater for long periods of time.

A scuba diver carries metal tanks (that hold compressed air or a special mixture of breathing gases) on his back and wears a mask and fins.

Breathing compressed air will damage the lungs. How can the compressed air be made safe to breathe?

The diver breathes air from the tanks through a hose. The air is fed to the diver's mouthpiece through a regulator which does two things:

  • It automatically reduces the pressure of the air from the tank to a safe level (equalized with outside water pressure) for the diver to inhale.

  • It supplies air when the diver inhales.
When the diver exhales, the air from his lungs is released into the water and is seen as a rush of rising bubbles.

"George Files" by Parenting the Next Generation