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.