DIVING GLOSSARY · Underwater science
Absolute pressure
Pressure measured relative to a vacuum, including the atmospheric contribution.
Explore the idea in context
Definitions are a starting point. These lessons connect the word to examples, illustrations and further reading.
Underwater science
Pressure and depth
Explain why pressure changes below the surface.
Read lesson →Underwater science
Gas volume and pressure
Recognise the ideal relationship between gas volume and pressure.
Read lesson →Introductory definition · Instructor review pending.