What is in the breathing tanks? Is it just oxygen?
No. It is the same air we all breath. If you can imagine a container that is about 4ft X 4ft X 4ft, that is about the amount of air that has been squeezed down into a cylinder. Each tank is rated to be able to supply 30 to 45 minutes of air depending upon it’s volume and pressure it is rated for. But this is based upon no exertion at all. A fire fighter is doing good to get 10-15 minutes from a tank at a fire.
