To help deep-sea divers breathe, they carry cylinders of oxygen mixed

June 1, 2025 by rawan239

To help deep-sea divers breathe, they carry cylinders of oxygen mixed with

[amp_mcq option1=”chlorine” option2=”helium” option3=”nitrogen” option4=”ozone” correct=”option2″]

This question was previously asked in

UPSC NDA-2 – 2022

Download PDF Attempt Online

To help deep-sea divers breathe, they carry cylinders of oxygen mixed with helium.

At high pressures experienced during deep-sea dives, the nitrogen in air can cause nitrogen narcosis, which impairs judgment and coordination. Oxygen at high partial pressures can also become toxic. To avoid these issues, the breathing gas mixture often replaces nitrogen with helium, which is less narcotic and also less dense than nitrogen, making breathing easier at depth. This mixture of oxygen and helium is called Heliox.

Other gas mixtures like Trimix (oxygen, helium, and nitrogen) are also used depending on the depth and duration of the dive. Chlorine and ozone are toxic gases and would not be used in breathing mixtures.

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