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Changes Around Us Class 6 Notes CBSE Science Chapter 6 [Free PDF Download]

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Revision Notes for CBSE Class 6 Science Chapter 6 - Free PDF Download

Free PDF download of Class 6 Science Chapter 6 - Changes around Us Revision Notes & Short Key-notes prepared by expert Science teachers from latest edition of CBSE(NCERT) books. Register Online for NCERT Class 6 Science tuition on to score more marks in CBSE board examination. Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. Maths Students who are looking for the better solutions ,they can download Class 6 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations. 

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Access Class 6 Science CHAPTER 6- Changes Around Us

What is Change?

  • Any alteration of a substance from its original shape, size and state is known as a change.

  • Some changes can be reversible and some can be irreversible

  • Reversible Change: It is a change that can be undone or reversed.

  • For example: Melting of ice and inflation of a balloon.

  • Irreversible Change: An irreversible change is when something cannot be changed back to its original form.

  • For example: Burning of  paper and cooking of food.

There are Two Types of Change: 

1. Physical Change: A change in which a substance undergoes a change in its physical properties such as shape, size, volume, colour, appearance, state of a substance (solid, liquid, and gas) is termed physical change.

a. Example of physical changes: Boiling water, mixing sand and water, melting an ice cube, freezing water etc.

b. Physical changes are usually reversible.

2. Chemical Change: A change in which one chemical substance is transformed into one or more different substances is termed as chemical change.

a. Example of chemical changes: Burning wood, souring milk, mixing acid and base, rusting of iron etc.

b. Chemical changes are usually irreversible.

Some Factors Leading to Change:

1. Evaporation: The changing of water into water vapour.

2. Melting: The process in which a solid converts to a liquid by applying heat.

3. Freezing: The process in which a liquid turns into solid when its temperature is lowered.

4. Boiling: The rapid vaporization of a liquid when it is heated to its boiling point.

5. Condensation: The change of water vapor into liquid water on cooling.

6. Expansion: A process in which an object becomes bigger in size.

7. Contraction: A process in which an object becomes smaller or shrinks. 

8. Applying Pressure: Pressure can change the size of an object. Air is also compressed and liquified by applying pressure.  

Some Examples of Changes Around Us

  1. Change in weather.

  2. In the field crops change from time to time.

  3. Flowers bloom and then wither away.

  4. Change in day and night.

  5. Change in the shape of the moon in a month.

  6. Change in season throughout the year.

  7. Changes taking place in our body like growing of nails, hair, height.

  8. Rusting of iron.

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FAQs on Changes Around Us Class 6 Notes CBSE Science Chapter 6 [Free PDF Download]

1. What are the changes around us?

A change is implied as to any transition or modification in the original form of a substance. Chapter 6 “Changes Around Us” of Class 6 Science explains the various processes involved in the changes that occur in the environment around us. They describe the processes that lead to changes like evaporation, boiling, freezing and condensation. A few examples of the changes occurring around us have been illustrated in the chapter such as seasonal change, changes in weather, and rusting of metals.

2. What is a change according to Chapter 6 “Changes Around Us” of Class 6 Science?

Chapter 6 “Changes Around Us” of Class 6 Science explains the changes that happen around us and the several processes involved in the cause of change. The chapter makes us aware of the different changes that occur in our surrounding environment and the different processes involved in the change. The process of change has been defined in the chapter as any transition, alteration, modification in the original or natural form of a substance by processes such as evaporation, boiling, condensation, freezing, expansion, and contraction.

3. How many types of changes are there as mentioned in Chapter 6 of Class 6 Science?

The process of any transition in the form of a substance has been defined as a change in Chapter 6 “Changes Around Us” of Class 6 and based on this definition, there are two types of changes. The first type of change is Physical change, in which the physical properties of a substance like its shape, size, colour or appearance,  undergo a transition. The second type of change is Chemical change, in which one chemical substance transforms into one or more different substances.

4. How does change occur as given in Chapter 6 of Class 6 Science?

Change means any kind of transition in the original form and state of a substance. The transitions and changes in any substance occur due to various processes, such as evaporation in which water changes into vapour, melting, in which solid turns into liquid, freezing, in which a liquid substance becomes solid, condensation, in which the vapour returns into the liquid state upon cooling, expansion, in which an object expands in size, and contraction, in which an object shrinks in size. To know more students can visit the Vedantu app or website.

5. What is meant by reversible and irreversible change?

According to the definition of Chapter 6, change is perceived to be any transition in the original aspect of any substance. Based on this definition, changes are characterised as reversible and irreversible changes. Reversible change is the kind of change that can be undone or reversed to its original state, for instance, inflating and deflating a balloon. Irreversible change, on the contrary, means a change that can not be reversed and is permanent, for example, the burning of an object. To know more about this chapter, students can download the revision notes free of cost from the Vedantu website.