DIVING GLOSSARY · Underwater science
Breathing gas
Gas intended for breathing during the activity; its composition and suitability must be established.
Explore the idea in context
Definitions are a starting point. These lessons connect the word to examples, illustrations and further reading.
Know your equipment
Cylinders and their labels
Recognise a cylinder as a documented pressure vessel.
Read lesson →Underwater science
Breathing gases are not interchangeable
Recognise why a gas name implies training and limits.
Read lesson →Diving with a buddy
Gas awareness and the shared plan
Understand why gas information belongs in training and planning.
Read lesson →Introductory definition · Instructor review pending.