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प्रश्न
What are fuels?
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उत्तर
Fuels: The substances which burn in air to produce a large amount of energy in the form of heat and light are called fuels.
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संबंधित प्रश्न
Fill in the blank :
________ is the most abundant inert gas present in air.
State three uses of water vapour in the air.
Give reason:
When water is heated, we see bubbles rising up.
With the help of a labeled diagram, describe a simple experiment to show the presence of oxygen and nitrogen in air using a piece of white phosphorus.
State the utility of oxygen for respiration in living organisms
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
Mention one necessary condition for the combustion to take place.
What is the composition of air?
The amount of water vapour in the air is more in windy places than in other areas.
The composition of air changes slightly from place to place. Give examples.
