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Kotie's Scuba Physics FAQ - Answers to scuba diving and scuba gear questions

Hi there. I would like to share a bit of my scuba diving knowledge so you can be as smart as me.
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Scuba Physics Questions

How deep can i dive on nitox?

A breathing mixture containing a higher proportion of oxygen than normal air. Commonly used in mixes of 32% and 36% oxygen breathing gases for recreational. The additional oxygen reduces the nitrogen absorption in the blood, lowering the risk for nitrogen narcosis and decompression sickness. At 32 percent you can dive to a maximum depth of 120 feet and at 36 percent you can dive to a maximum depth of 110 feet.

How deep can i dive?

This depends on your tank pressure, volume, the depth of your dive, the workload, the water temperature and your personal breathing rate. But let's say that many people could dive at a depth of 60 feet with a standard aluminum tank filled to 3000psi for half an hour. Recreational limits are 130 feet. Specialty training is available for deeper diving.

How do you prevent decompression sickness?

There is information and many different tools available to help you make decisions about preventing decompression. None of these, however, can make decisions for you. It is up to each diver to decide how deep and how long to make a dive. These two considerations are the most important in avoiding decompression sickness. Although the tools such as dive computers can give good advice, it is the divers decision to avoid pushing the limits that will help you prevent decompression sickness.

How long will a tank last on a dive?

This depends on your tank pressure, volume, the depth of your dive, the workload, the water temperature and your personal breathing rate. But let's say that many people could dive at a depth of 60 feet with a standard aluminum tank filled to 3000psi for half an hour.

What is a longshore current?

These are currents generated by waves hitting the shore at an angle. The current created runs parallel to the coastline.

What is altitude diving?

Any dive conducted above sea level can be considered an altitude dive. Generally, dives over 1000 feet would require different dive tables and/or calculations.

What is an atmosphere?

Every 33 feet of seawater is equal to one atmosphere of pressure.

What is anoxia?

Anoxia is the absence of oxygen to the body's tissues.

What is dci?

DCI or Decompression Illness is Type III decompression sickness and groups DCS and arterial gas embolism together.

What is dcr?

DCR or Depth Consumption Rate is equal to the air used divided by the time.

What is dsi?

DCI or Decompression Illness is Type III decompression sickness and groups DCS and arterial gas embolism together.

What is eanx?

A breathing mixture containing a higher proportion of oxygen than normal air. Commonly used in mixes of 32% and 36% oxygen breathing gases for recreational. The additional oxygen reduces the nitrogen absorption in the blood, lowering the risk for nitrogen narcosis and decompression sickness. At 32 percent you can dive to a maximum depth of 120 feet and at 36 percent you can dive to a maximum depth of 110 feet.

What is hyperthermia?

This is the rise in the core body temperature to an unsafe level.

What is hypoxia?

Hypoxia means insufficient oxygen, which can quickly lead to tissue damage especially to nerve tissues. Severe tissue damage by hypoxia is called anoxia.

What is my air consumption?

Air consumption calulations must always be based on Surface Air Consumption Rates or SAC Rate. The SAC rate is easliy obtained by dividing the Depth Consumption Rate or DCR by absolute atmospheres.

What is shallow water blackout?

Shallow-water blackout is a sudden unconsciousness from lack of oxygen during a breath-hold dive. Shallow-water blackout doesn't always occur in shallow water; it can occur at any depth. However, the breath hold diver is at greater risk for blacking out during ascent, near the surface.

What is subcutaneous emphysema?

The presence of gas within the tissue beneath the skin.

What is the ascent rate based on a 90 foot dive??

The slower the better but no faster than 60 feet per minute and don't forget your safety stop.

What is the benefit of a balanced regulator?

A balanced regulator will perform the same throughout the changes in cylinder pressure.

What is the difference between a balanced and an unbalanced regulator?

A balanced regulator has higher performance. These regulators are not affected by changes in cylinder pressure and will not gradually become harder to breathe from as the tank pressure gets lower.

What is trimix?

Trimix is a term which refers to the breathing gas a diver uses other than air or nitrox. The mixture involves three gases, typically oxygen, helium, and nitrogen.

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