Define Kinetic Theory Of Matter.

The kinetic theory of matter helps us to explain why matter exists in different phases (i.e. solid, liquid and gas), and how matter can change from one phase to the next. The kinetic theory of matter also helps us to understand other properties of matter.

Some assumptions made regarding the kinetic theory of matter are:
  • Molecules are in a state of continuous motion and hence they possess kinetic energy.
  • The kinetic energy of molecules increases with an increase in temperature and decreases with a decrease in temperature.
  • The molecules of a similar kind attract each other by a force called the force of cohesion.
  • The force of cohesion is maximum in solids, less in liquids, and least in gases.
  • The force of attraction between different types of molecules is called the force of adhesion.
  • The force of attraction between the molecules (either cohesive or adhesive) is called the intermolecular force of attraction.
  • The space between any two consecutive molecules is called intermolecular space.
  • If the intermolecular space between the molecules decreases, the intermolecular force increases.


Simply Easy Learning

Updated on: 10-Oct-2022


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