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प्रश्न
Name the important scientists and their studies which led to the discovery of the components of air.
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उत्तर
Discovery of air:
- John Mayow (1674) proved air has two components – active and inactive components.
- Lavoisier (1789) named active component as oxygen and inactive component as nitrogen
- Other scientists (1800’s) discovered noble gases, C02, water vapours.
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संबंधित प्रश्न
Give two uses of the following component present in air:
oxygen
Give two uses of the following component present in air:
carbon dioxide
Define the following:
Respiration
Name three greenhouse gases.
State what do you understand by the term ‘air’. Explain its importance to mankind.
State the meaning of the term atmosphere.
State whether the following statement is true or false. If false, correct them.
Air does not occupy any space.
Make sentences using the given set of words.
Air, wind, motion, called
Explain the following observations very briefly
A firki does not rotate in a closed area.
Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle air tight till it cooled down to room temperature.
Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer.
