changes around us

This ppt prepared by Student-Teacher from Thiagarajar College of Preceptors-Madurai for Demo Class.

1. Changes around us BY, S.SWETHA 19PHY162 ‘D’ SECTION

2. introduction Change is the law of nature In our day to day life we see many changes around us. Weather changes periodically (daily/ seasonly ), season change periodically. Some changes can be observed while some are not possible to notice There are different types of changes that occur around us Some changes take place very quickly while others take hours, days or even years

3. changes Some changes are temporary while some others are permanent Some changes produce new substance while others do not Some changes are natural while others are made by human beings Some changes are desirable to us but some changes are not desirable

4. types of changes Slow and fast changes Reversible and irreversible changes Physical and chemical changes Desirable and undesirable changes Natural and man-made changes

5. Slow change

6. Slow changes Changes which take place over a long period of time (hours/ days/ months/ years) are known as slow changes Examples : 1) growth of nail and hair 2) change of seasons 3) germination of seed

7. Fast changes

8. Fast changes Changes which take place within a short period of time (seconds or minutes) are known as fast changes Examples: 1) bursting of balloon 2) breaking of glass 3) bursting of fire crackers 4) burning of paper

9. Differentiate fast and slow changes

10. Reversible changes

11. Reversible changes Changes which can be reversed (to back the original state) are known as reversible changes Example: 1) touch me not plant (responding to touch) 2) stretching of rubber band 3) melting of ice

12. Irreversible changes

13. Irreversible change Changes which cannot be reversed or to get back the original state are known as irreversible changes Examples: 1) change of milk into curd 2) digestion of food 3) making idly from batter

14. Differentiate reversible and irreversible changes

15. Examples for reversible and irreversible change

16. conclusion Every day we observe Changes Around Us. For example the change of day and night, flowering of plants, ripening of fruits, rainfall etc. Change is the transition of any substance from one form to another.