CBSE 9 Science | 1. Matter in Our Surroundings by Akhil | Learn Smarter
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1. Matter in Our Surroundings

Matter exists in various forms and is classified into three states: solid, liquid, and gas, each defined by the arrangement and movement of its particles. Changes in temperature and pressure can convert matter from one state to another through processes like melting, boiling, sublimation, and deposition. The properties of matter, including density and the intermolecular forces, present important characteristics for understanding its behavior in different contexts.

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Sections

  • 1

    Matter In Our Surroundings

    Matter is anything that occupies space and has mass, classified into three primary states: solid, liquid, and gas.

    Learning Practice

  • 1.1

    Physical Nature Of Matter

    This section introduces the concept of matter, outlining its definition, classification, and the essential physical properties that characterize it, such as mass, volume, and the particulate nature of its components.

    Learning Practice

  • 1.1.1

    Matter Is Made Up Of Particles

    This section explores the concept of matter being composed of particles, their properties, and the activities that illustrate these ideas.

    Learning Practice

  • 1.1.2

    How Small Are These Particles Of Matter?

    This section explores the concept that matter is composed of extremely small particles and describes their properties and behavior.

    Learning Practice

  • 1.2

    Characteristics Of Particles Of Matter

    This section explores the characteristics of particles that make up matter and how these characteristics affect the properties and states of matter.

    Learning Practice

  • 1.2.1

    Particles Of Matter Have Space Between Them

    This section explains that matter is composed of particles that have space between them, allowing for various physical interactions and behaviors.

    Learning Practice

  • 1.2.2

    Particles Of Matter Are Continuously Moving

    This section explains that particles of matter are in constant motion, influenced by temperature, leading to phenomena like diffusion.

    Learning Practice

  • 1.2.3

    Particles Of Matter Attract Each Other

    This section discusses the concept that particles of matter exert forces of attraction on each other, explaining how this affects the properties of solids, liquids, and gases.

    Learning Practice

  • 1.3

    States Of Matter

    Matter exists in three primary states: solid, liquid, and gas, based on the arrangement and movement of particles.

    Learning Practice

  • 1.3.1

    The Solid State

    The solid state of matter is characterized by definite shape, fixed volume, and resistance to compression, with particles closely packed together.

    Learning Practice

  • 1.3.2

    The Liquid State

    This section explores the characteristics and properties of liquids, highlighting their fluidity, fixed volume, and behavior in different containers.

    Learning Practice

  • 1.3.3

    The Gaseous State

    This section explores the gaseous state of matter, focusing on the properties of gases and their behavior compared to liquids and solids.

    Learning Practice

  • 1.4

    Can Matter Change Its State?

    This section explores the processes of melting and boiling, explaining how matter changes its state under different temperature and pressure conditions.

    Learning Practice

  • 1.4.1

    Effect Of Change Of Temperature

    This section discusses how temperature changes affect the states of matter, illustrating the concepts of melting, boiling, and sublimation.

    Learning Practice

  • 1.4.2

    Effect Of Change Of Pressure

    This section discusses how changes in pressure affect the state of matter and the behavior of particles.

    Learning Practice

  • 1.5

    Evaporation

    Evaporation is the process where liquid transforms into vapor at any temperature below its boiling point, influenced by factors like temperature, surface area, humidity, and wind speed.

    Learning Practice

  • 1.5.1

    Factors Affecting Evaporation

    This section discusses the key factors influencing the process of evaporation.

    Learning Practice

  • 1.5.2

    How Does Evaporation Cause Cooling?

    Evaporation of liquids leads to cooling as the particles absorb energy from their surroundings.

    Learning Practice

References

NCERT Study Material

Class Notes

Memorization

What we have learnt

  • Matter is made up of small ...
  • The matter around us exists...
  • The forces of attraction be...

Final Test

Revision Tests

Chapter FAQs