Question

After they all knew why people use blankets during fire breakouts. Kenneth came up with another question.
Kenneth: Why do mountaineers carry oxygen cylinders with them ?
John: Even I wanted to know this, air is present everywhere then why to carry such heavy cylinders with them.
Kenneth: Give us an explanation Sam.

Which of the following can be an explanation for the above question?

• A. Amount of oxygen in air decreases as the height increases.
• B. Amount of oxygen in air has nothing to do with height.
• C. Mountaineers like it to carry heavy weights with them.
• D. There is no air in the mountains so mountaineers carry oxygen cylinders with them.

Answer 1

The correct option is A

Amount of oxygen in air decreases as the height increases.

As we go up, the density of air decreases with increasing height and so the amount of oxygen present in air also decreases. With increasing height air becomes thinner and thinner and there is no sufficient amount of oxygen in air for breathing. To maintain the continuous and sufficient supply of oxygen for breathing mountaineers carry oxygen cylinders with them.