SECTION 3 · 10 LESSONS
Underwater science
Explore the physical ideas behind pressure, buoyancy and the underwater environment.
Start with lesson one
Your ten lessons
Each lesson includes an illustration, a visual explanation, a reference table and a knowledge check. Work through them in order or revisit a question.
- 01
Pressure and depth
Explain why pressure changes below the surface.
- 02
Gas volume and pressure
Recognise the ideal relationship between gas volume and pressure.
- 03
Buoyancy as a force
Describe positive, negative and neutral buoyancy.
- 04
Saltwater and freshwater
Connect water density with buoyant force.
- 05
Trim and body position
Distinguish orientation from overall buoyancy.
- 06
Light and colour underwater
Understand why underwater colour and brightness change.
- 07
Sound underwater
Recognise that sound behaves differently in water.
- 08
Heat and comfort
Understand why exposure protection is part of planning.
- 09
Breathing gases are not interchangeable
Recognise why a gas name implies training and limits.
- 10
Models, measurements and limits
Distinguish a model from a direct measurement.