Class 9th Science Matter In Our Surrounding NCERT Notes CBSE 2023
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Matter in Our Surroundings Class 9 Notes

Matter in Our Surroundings Class 9 Notes

Chapter 1 Matter in Our Surroundings

Chapter 1 of CBSE Class 9 Science is entitled "Materials in Our Environment ''. In this chapter, students learn about the physical properties of matter, the properties of matter particles, states of matter, and evaporation. This is an important chapter in the CBSE Grade 9 science curriculum that provides a foundation for understanding matter and its nature. Students can better understand the main concepts of the chapter by practicing answering questions with NCERT notes for 9th Grade Chapter 1 Science about substances, interconversion of substances, evaporation, etc. Vidyakul provides over 450 exercises covering all the subtopics covered in Chapter 1. Students should focus on practicing text questions provided by Vidyakul in order to get good grades. 

Read on to find out more.


Points to Remember

Below we have provided some of the important points to remember for NCERT Class 9 Science Chapter 1 to ace your exams:

  • Matter: Anything which has mass and occupies some space is called matter
    Solid, liquid and gas are not the substances but three different states of the same substance

  • Characteristics of particles of matter: The states of a substance differ with respect to interparticle spaces and intermolecular forces.
    The arrangement of the constituent particles is most ordered in solid state. It is comparatively less in the liquid state, while the particles can move quite freely in the gaseous state.

  • States of matter: Solids have fixed shape and definite volume.
    Liquids have definite volume but no fixed shape.
    Gases have neither fixed shape nor definite volume.
    The kinetic energy of particles is maximum in the gaseous state and minimum in the solid state.
    The diffusion of the gases varies inversely as the square root of their densities.
    Lighter gases can move upwards and heavier gases can move downwards.
    Gases can be compressed to a large extent by applying pressure.

  • Evaporation: Evaporation is a surface phenomenon, whereas boiling is a bulk phenomenon.
    Increase in the surface area increases the evaporation of a liquid.
    We perspire more on a humid day than on a dry day.
    Low boiling liquids evaporate faster than high boiling liquids
    Cooling is caused during evaporation and not during boiling.

Topics and Sub-topics

Chapter 1 of NCERT notes for Grade 9 Science is one of the more interesting chapters. Students need to practice a variety of problems to learn how to solve them. Practicing the NCERT notes after reviewing the topic regularly can help students master the topic and achieve better test scores.

Vidyakul provides answers to all questions from the CBSE Class 9 Science Chapter 1 textbook based on the latest syllabus. Students get free access to all notes. Vidyakul provides NCERT examples, Vidyakul explanations, and more for free.

Below, we have provided the list of topics included in this chapter:

Sr No

Topic Name


Physical Nature of Matter


Characteristics of Particles of Matter


States of Matter


Interconversion of Matter



Few Important Questions

  • What is ‘Latent heat of fusion’?

The latent heat of fusion is the enthalpy change of any amount of substance when it melts.

  • What does ‘Sublimation critical point’ mean?

Sublimation critical point refers to the maximum or minimum temperature and pressure beyond which the state of the matter cannot be changed.

  • What does ‘Interconversion of matter’ mean?

Interconversion of matter refers to the change of one state to another. It is a process by which matter changes from one state to another and back to its original state, without any change in its chemical composition.

Learn more about it in Matter in Our Surroundings Class 9 Notes pdf.

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Matter in Our Surroundings Class 9 Science Notes Part - 1

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Matter in Our Surroundings Class 9 Science Notes Part - 6