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Question

Explain the statement ‘Gases have neither a fixed shape nor a fixed volume’.


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Solution

  • There are five main physical states of matter, solids liquids, gases, plasma, and Bose-Einstein condensate.
  • Matter in the gaseous state is characterized by a very loosely packed arrangement of molecules.
  • The force of attraction between the gas molecules is very low.
  • The intermolecular space is large.
  • Due to this molecular arrangement there are negligible intermolecular forces of attraction in the gaseous state.
  • Molecules of the gas are in the state of random motion resulting in continuous collisions among themselves and with the walls of the container exerting pressure.
  • The kinetic energy of the molecules is proportional to the temperature.
  • Gases possess low density compared to liquids and solids.
  • Gases exert pressure equally in all directions.
  • Gases are capable of great expansion.
  • Hence we can conclude that gases do not possess definite volume and shape.

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