Larry Wedgewood Scuba Diving Instruction

Learning Guide - Open Water Course  

The Effects of Increasing Pressure on Body Air Spaces

Lesson 8

Course Complete

Watch the video above and then answer the quiz questions below

You need a mask to see clearly underwater. Your eyes must be in air to focus properly, but your mask creates an air space that you have to equalize. This is why your mask must enclose your nose – so you can blow air into it. It’s also why you never scuba dive with goggles. You can’t equalize them, so you would get a squeeze.

Quick Quiz

1. As I descend, increasing pressure affects my (choose all that apply)
2. A squeeze is caused by
3. Equalization is the process of
4. I should equalize
5. I’m descending and discover I can’t equalize. The first thing I would do is
6. I equalize gently because an extended, forceful equalization can cause permanent damage to my ears and hearing.
7. On a day I plan to go diving, I wake up with my sinuses blocked due to a cold or allergy. I should
8. When scuba diving, normal breathing keeps your lungs equalized to the surrounding pressure.

 

Module One

Water Pressure and Air Volume Effects

Water Pressure and Air Volume Effects

The Effects of Increasing Pressure on Body Air Spaces Topic 2 of 6

The Effects of Increasing Pressure on Body Air Spaces Topic 2 of 6

The Effects of Decreasing Pressure on Body Air Spaces Topic 3 of 6

The Effects of Decreasing Pressure on Body Air Spaces Topic 3 of 6

Breathing Underwater

Breathing Underwater

Buoyancy and Controlling Buoyancy Topic 5 of 6

Buoyancy and Controlling Buoyancy Topic 5 of 6

The Buddy System

The Buddy System

Choosing and Caring for Scuba Equipment

Choosing and Caring for Scuba Equipment

Dive Masks

Dive Masks

Snorkles

Snorkles

Fins

Fins

Scuba Kit

Scuba Kit

BCD (Buoyancy Control Device)

BCD (Buoyancy Control Device)

Regulators

Regulators

Scuba Cylinders

Scuba Cylinders

Weight Systems

Weight Systems

How to Defog Your Mask

How to Defog Your Mask

Setting Up Your Scuba Kit

Setting Up Your Scuba Kit

Inflating and Deflating Your BCD

Inflating and Deflating Your BCD

Gearing Up With Your Buddy(ies)

Gearing Up With Your Buddy(ies)

Breathing Underwater

Breathing Underwater

Hand Signals

Hand Signals

Regulator Clearing

Regulator Clearing

Regulator Recovery

Regulator Recovery

Clearing Water Out of Your Mask

Clearing Water Out of Your Mask

Managing Your Air Supply

Managing Your Air Supply

Descending and Equalizing

Descending and Equalizing

Swimming Underwater

Swimming Underwater

Alternate Air Source (AAS) User

Alternate Air Source (AAS) User

Ascents and Returning to the Surface

Ascents and Returning to the Surface

Emergency Weight Drop

Emergency Weight Drop

BCD Oral Inflation at the Surface

BCD Oral Inflation at the Surface

Exiting the Water

Exiting the Water

After the Dive

After the Dive

Knowledge Review One

Knowledge Review One

Module One Quiz

Module One Quiz

Course Complete
Larry Wedgewood Scuba Diving Instruction

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