NCERT Question 5 - Chapter 6 Class 6 - Changes around us

Reversible change

Irreversible Change

1. INFLATION AND DEFLATION OF A BALLOON

• Take a balloon  and blow it.
• Make sure it does not burst.

• The balloon changes its shape and size because of the air blown into it.
• Now ,release the air which is filled in the balloon.
• You will notice that the balloon comes back to its original shape.
• The change is reversible.

1. BURSTING A BALLOON

• Take a Balloon.
• Blow it to the full size and tie its mouth with a string.
• Prick it with a pointed pencil.

• The balloon burst.
• Now the balloon which has  burst cannot be blown again.
• This change is irreversible.

• MAKING PAPER PLANE

• Take a piece of paper
• Fold it to make an airplane
• Shape and size of the paper changes
• When you are bored, you can open the paper and it wil l come to its original shape and size
• So. The change here is reversible.

2. CUTTING AIRPLANE SHAPE OUT OF PAPER

• Take a piece of paper
• Draw a airplane on it
• Cut it along with the outline
• Paper which is cut once along its shape cannot be regained again.Thus,this change is irreversible