Question

give two examples to show presence of air

Answer 1

Answer:

Even though we can't see air we can detect its presence by

1. WE CAN FEEL AIR WHEN IT MOVES FAST IN FORM OF A WIND

2. AIR IS FILLED IN A BALLOON CAUSES IT TO GROW IN SIZE

3. AIR IS HEAVIER BECAUSE WHEN WE FILL A BALLOON WITH AIR, IT IS HEAVIER THAN A NORMAL BALLOON

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Answer 2

Answer:

Materials required : Firki mounted on a stick.

Procedure : Take (or make ) a Firki mounted on a thin stick and move it in different directions in an open area .

what did you observe ?

Observation: The Firki start rotating.

Conclusion : The Firki moves / rotates when the air strikes it's blades .

This shows that the air is present around us .