Certified Hyperbaric Technologist Test CHT Hyperbaric Physics and Gas Laws 2

Question 1

A sealed flexible bag holds 6 L of gas at the surface (1 ATA). At 3 ATA in a hyperbaric chamber, what is its approximate volume, assuming constant temperature?

Accepted Answer

2 L

Answer

Boyle's Law gives V2 = (P1V1)/P2 = (1 x 6)/3 = 2 L.

Question 2

Which gas law best explains why nitrogen narcosis worsens as a diver or chamber occupant goes deeper?

Accepted Answer

Henry's Law

Answer

Henry's Law states the amount of gas dissolved in tissue rises with partial pressure, increasing nitrogen's narcotic effect.

Question 3

At 2 ATA, what is the partial pressure of oxygen in air (21% O2)?

Accepted Answer

0.42 ATA

Answer

Partial pressure = fraction x total pressure = 0.21 x 2 = 0.42 ATA.

Question 4

Dalton's Law of partial pressures states that the total pressure of a gas mixture equals what?

Accepted Answer

The sum of the partial pressures of each gas

Answer

Dalton's Law: total pressure is the sum of each gas's partial pressure.

Question 5

Why does a sealed rigid gas cylinder show increased pressure when moved from a cold storage room into a warm chamber?

Accepted Answer

Gay-Lussac's Law

Answer

Gay-Lussac's Law states pressure is directly proportional to absolute temperature at constant volume.

Certified Hyperbaric Technologist Test Practice Test

Certified Hyperbaric Technologist Test Practice Test

Certified Hyperbaric Technologist Test CHT Hyperbaric Physics and Gas Laws 2