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प्रश्न
How do astronauts breathe when they go beyond the earth’s atmosphere?
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उत्तर
It is because nitrogen tires hold pressure longer as compared to compressed air. Nitrogen gas in the tire escapes more slowly than compressed air does.
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संबंधित प्रश्न
Give reason:
Mountaineers and divers carry oxygen cylinders with them.
Give reason:
When water is heated, we see bubbles rising up.
Fill in the blank
The reddish-brown powder on the surface of iron nails exposed to air and moisture is called _____.
Air is made up of oxygen only.
______ is the active component of air.
Nitrogen is _______ than air.
The component of air used by green plants to make their food, is ______.
Match the following
| 1. | Oxygen | a. | Carbon dioxide |
| 2. | Azote | b. | Nitrogen |
| 3. | Solvay process | c. | Vital life |
| 4. | Gun powder | d. | No life |
Usha took a lump of dry soil in a glass and added water to it till it was completely immersed. She observed bubbles coming out. The bubbles contain ______.
Observe the picture given in Fig. carefully and answer the following questions.
Why is he putting a cover on his nose?
