How Diving Affects Your Body: Pressure, Buoyancy, and Physiology

Dive Tables and the eRDPML: Reading No-Decompression LimitsNext

Every PADI knowledge review opens with physics, because pressure changes are the reason diving has rules at all. As you descend, water pressure increases roughly 1 atmosphere every 10 meters (33 feet), compressing the air in your lungs, mask, and BCD and requiring you to equalize continuously. Understanding Boyle's Law in practical terms, why a full breath at depth expands dangerously on ascent, is the single concept that underlies buoyancy control, ascent rates, and lung overexpansion injury prevention.

This lesson walks through pressure-volume relationships using the same worked examples PADI uses in its own manual, then connects them directly to the buoyancy checks and slow-ascent habits you will be tested on.

Open Water Foundations

How Diving Affects Your Body: Pressure, Buoyancy, and Physiology Dive Tables and the eRDPML: Reading No-Decompression Limits Buoyancy Control and Weighting Emergency Procedures and Out-of-Air Skills

Equipment and Dive Planning

Scuba Equipment Systems: Regulators, BCDs, and Gauges Dive Planning and the Buddy System Environment Awareness and Local Conditions

Advanced Open Water Adventure Dives

Deep Diving Fundamentals and Nitrogen Narcosis Underwater Navigation Peak Performance Buoyancy and Specialty Dive Options

Rescue Diver: Self-Rescue and Stress Recognition

Recognizing Diver Stress Before It Becomes an Emergency Self-Rescue Techniques and Cramp Management

Rescue Diver: The 10 Emergency Management Patterns

Panicked Diver Response at the Surface Unresponsive Diver: Underwater and Surface Response Missing Diver Procedures and Emergency Action Plans