Free Chemistry Dictionary

Video Example : Gaseous State

Gaseous State


  • Troposphere
  • Highly compressible
  • Pressure
  • Density
  • Gas laws

Definition of Gaseous State

It is one of the three states of matter in which the intermolecular forces of attraction are weak. It is the simplest state of matter

More About Gaseous State

  • Throughout our life we remain immersed in the ocean of air which is a mixture of gases
  • We spend our life in the lowermost layer of atmosphere called troposphere which is held to the surface of the earth by gravitational force
  • The troposphere shields us from harmful radiations and contains many useful gases such as carbon dioxide, nitrogen and oxygen
  • Only eleven elements in the periodic table exist in the gaseous state under normal conditions
  • Forces of attraction between their molecules is negligible
  • Their behaviour is governed by some general laws
  • The characteristic properties of gaseous state are
  • Gases are highly compressible
  • Gases exert pressure equally in all directions
  • Gases have lower density than solids or liquids
  • The volume and the shape of gases are not fixed
  • Gases mix evenly in all proportions and without any mechanical aid
  • The properties exhibited by gases is due to the fact that intermolecular forces of attraction in gases are weak
  • The behaviour of gases is governed by some general laws; these laws are relationships between measurable properties of gases
  • A gas that is enclosed in a container exerts a pressure on the inner walls of that container
  • This pressure is the result of the countless collisions of the gas particles with the container wall
  • The various properties of gases are pressure, volume and temperature
  • The interdependence of these properties of gases leads to various gas laws
  • The relationship between these variables describe the state of gas
  • A gas has neither a definite volume nor a definite shape
  • Examples of gases are air, oxygen, and helium
  • Gases are compressible, have low densities, mix thoroughly (are all miscible, fills a container uniformly, exerts pressure uniformly on all sides of a container


Which of the following is false about gases?

    A) They posses random movement in all directions
    B) Gases intermix freely in all directions without any external aid
    C) Gases are highly compressible
    D) Gases possess definite volume

Answer: D - Gases do not possess definite volume they assume the volume of the container