Certified Hyperbaric Technologist Test CHT Hyperbaric Physics and Gas Laws 4

Question 1

Using absolute temperature, a 5 L gas at 300 K is warmed to 600 K at constant pressure. What is the new volume?

Accepted Answer

10 L

Answer

By Charles's Law, doubling absolute temperature doubles volume: 5 L becomes 10 L.

Question 2

Why must temperatures be converted to the Kelvin scale when applying gas laws?

Accepted Answer

Kelvin avoids negative values and represents true absolute zero

Answer

Gas laws require an absolute temperature scale because proportionality only holds when zero corresponds to absolute zero.

Question 3

A diver breathing a mix of 32% oxygen at 2 ATA has what oxygen partial pressure?

Accepted Answer

0.64 ATA

Answer

PO2 = 0.32 x 2 = 0.64 ATA.

Question 4

Which condition results from a trapped gas pocket expanding in the lungs during rapid ascent?

Accepted Answer

Pulmonary barotrauma

Answer

Boyle's Law expansion of trapped lung gas during ascent can cause pulmonary barotrauma.

Question 5

According to Henry's Law, doubling the partial pressure of a gas over a liquid does what to the dissolved amount?

Accepted Answer

Doubles it

Answer

Henry's Law: dissolved gas is directly proportional to partial pressure, so doubling pressure doubles the dissolved gas.

Certified Hyperbaric Technologist Test Practice Test