NAUI INSTRUCTOR KEY CONCEPTS
AND REVISION NOTES
◉ Nitrox mixing methods
Answer: Partial pressure blending
Nitrogen separating membrane
Continuous gas blending
◉ An oxygen analyzer should display oxygen content to an accuracy
of:
Answer: 1/10 of a percent
◉ Kelvin scale
Answer: Absolute temperature scale based on the Celsius scale
◉ Pressure
Answer: Force acting on a unit of area
◉ Objects viewed through a scuba mask appear larger and closer
due to?
Answer: Refraction
, ◉ Archemedes Principle
Answer: "An object wholly or partially immersed in a fluid is buoyed
up by a force equal to the weight of the fluid displaced."
◉ What color is absorbed first in water?
Answer: Red
◉ What color is absorbed last in water?
Answer: Violet
◉ How much does pressure increase under water per foot
Answer: 0.445 psi per foot (0.10 bar per meter)
◉ Weight of fresh vs sea water (1 cubic ft)
Answer: Fresh - 62.4
Sea - 64.0
◉ The pressure exerted by any component gas in a mixture
Answer: Partial pressure of that gas
◉ Regulators delivery air at what pressure
Answer: Ambient pressure
AND REVISION NOTES
◉ Nitrox mixing methods
Answer: Partial pressure blending
Nitrogen separating membrane
Continuous gas blending
◉ An oxygen analyzer should display oxygen content to an accuracy
of:
Answer: 1/10 of a percent
◉ Kelvin scale
Answer: Absolute temperature scale based on the Celsius scale
◉ Pressure
Answer: Force acting on a unit of area
◉ Objects viewed through a scuba mask appear larger and closer
due to?
Answer: Refraction
, ◉ Archemedes Principle
Answer: "An object wholly or partially immersed in a fluid is buoyed
up by a force equal to the weight of the fluid displaced."
◉ What color is absorbed first in water?
Answer: Red
◉ What color is absorbed last in water?
Answer: Violet
◉ How much does pressure increase under water per foot
Answer: 0.445 psi per foot (0.10 bar per meter)
◉ Weight of fresh vs sea water (1 cubic ft)
Answer: Fresh - 62.4
Sea - 64.0
◉ The pressure exerted by any component gas in a mixture
Answer: Partial pressure of that gas
◉ Regulators delivery air at what pressure
Answer: Ambient pressure
