Question

why do mountaineers carry oxygen cylinders with them ?​

Answer 1

Answer:

because in high altitudes of mountains have lack of oxygen.

Answer 2

To breathe duh..

Jokes aside here is the explanation-

Mountaineers carry oxygen cylinders while going to high mountain peaks because altitude increases as they climb the mountain. The amount of oxygen decreases as the altitude increases. ... Therefore some parts of their body do not get sufficient supply of oxygen gas.

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