Q.

 Air fills ____ in a closed bottle.

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a

All the space    

b

Half-space

c

Some space

d

No space

answer is A.

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Detailed Solution

Air is a gas and the atoms and molecules of gas are widely spaced, due to which completely fills up a closed container.

The properties of air are:

  • Colourless and Odourless: Air is usually colourless and odourless.
  • Occupy Space: Air occupies space.
  • Exerts Pressure: It has weight, and air pressure is the force exerted by the weight of air. 
  • Expansion: Air expands and takes up more area.

Thus, air fills all the space in a closed bottle.

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