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प्रश्न
Give reason:
When water is heated, we see bubbles rising up.
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उत्तर
These bubbles come from the air dissolved in water. The marine life uses air dissolved in water.
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संबंधित प्रश्न
Answer the question put against the following constituents of air :
Water vapours : Explain their role in modifying the earth’s climate.
Fill in the blank
The reddish-brown powder on the surface of iron nails exposed to air and moisture is called _____.
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
The mesosphere in the atmosphere, contains most of the air, fit for respiration
Compare respiration and combustion-both involving oxygen of the air.
Write the percentage of the gases present in air.
_______ and ______ are the two gases, which when taken together, make up about 99 percentage of air.
- Nitrogen
- carbon-di-oxide
- Noble gases
- Oxygen
The balance of oxygen in atmosphere is maintained through photosynthesis in animals and respiration in plants.
What is the presence of harmful substance in the air called?
“Air is not an elementary substance, but a composition”. Why?
Observe the picture given in figure carefully and answer the following questions.
- What is covering the nose and mouth of the police man?
- Why is he putting a cover on his nose?
- Can you comment on air quality of the place shown in the figure?
