CBSE Class 9 Science Chapter Notes: Matter in Our Surroundings

This article brings you the CBSE Class 9 Science notes on chapter 1 ‘Matter in Our Surroundings’. These chapter notes are prepared by the subject experts and cover every important topic from the chapter. In between these notes, exercise questions are provided. Students must solve these questions to test their understanding about the learned topics. These questions will help you to track your preparation level and get a hold on the subject.

Main topics covered in CBSE Class 9 Science,  Matter in Our Surroundings: Capter Notes, are:

• Matter, its definition and caracteristics
• Diffusion and its Applications
• Brownian Motion
• States of Matter
• Interconversion of Three States of Matter
• Evaporation
• Important physical quantities and their SI unitsMatter:
  • Anything that occupies space and has mass is called matter.
  • It exists in the form of five basic elements, the Panch tatva – air, earth, fire , sky and water.
  • For example: Chair, bed, river, mountain, dog, tree, building, etc.

  Characteristics of matter:

  • Matter is made up of small particles called atoms.
  • These particles are too small to be observed with naked eye.
  • These particles are constantly moving constantly.
  • These particles have spaces between them.
  • Particles of matter attract each other because of the force of attraction.

  Diffusion:

  Particles of matter intermix on their own with each other. They do so by getting into the spaces between the particles. This intermixing of particles of two different types of matter on their own is called diffusion.

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