AOWD CHAPTER 4.05. DENSITY

Density is defined as the degree of compactness of the molecules of a substance. In other words, it is the measurement of how close the molecules of a substance are to each other. For instance, a container that consists of a substance that has a high number of...

AOWD CHAPTER 4.04. PRESSURE

Water is 700 to 800 times denser than air depending on its salinity. This is the primary factor that causes changes to a diver’s physiology, and makes it necessary to follow the required depth and time guidelines in order to avoid decompression illnesses. Pressure is...

AOWD CHAPTER 4.03. DIVING PHYSICS

During your SNSI Open Water Diver course, you learned the basics about the laws that affect divers during and after a dive. A more in depth understanding of these laws of physics is necessary in order for you to better understand what happens to your body and your...

AOWD CHAPTER 4.02. WHAT IS DEEP DIVING?

The meaning of the term “deep” as it applies to recreational diving has been a matter of debate for many years among scuba divers. It is a very subjective term. For some divers, 18 meters / 60 feet may be considered a deep dive, while for others, 39 meters / 130 feet...

AOWD CHAPTER 4.01. INTRODUCTION

Most divers, at some point or another in their diving career will want to dive deeper. In fact, many students, on their first day of training, ask how deep they can go after they are certified. Additionally, they instinctively ask what is required in order to dive...

AOWD CHAPTER 3.11. SUMMARY

SNSI believes that night diving and limited visibility diving are two distinct forms of diving. While they share certain similar skills, characteristics and equipment needs, they are not one and the same. However, limited visibility diving and night diving do share a...