Question

A list of words is given in a box. Use appropriate words to fill up the blanks in the following statements.

[Air, oxygen, wind, water vapor, mixture, combination, direction, road, bottles, cylinders]

Mountaineers carry oxygen ___ with them while climbing high mountains.

Answer 1

Mountaineers travel with an oxygen cylinder for the following reasons:

1. Because trees are not present at higher elevations, when they ascend mountains, the amount of oxygen in the atmospheric air diminishes as height increases.
2. As altitude increases, air pressure decreases.
3. The air pressure at the summit of the mountain is so low that oxygen cannot reach the blood selectively.

Thus, mountaineers carry oxygen cylinders with them while climbing high mountains.