Q7(A). Filling medicine in the dropper:
When we press the rubber part of dropper , it create low pressure inside the dropper. When we dip it to medicine and release the pressed part. Medicine flow to high to low pressure as medicine has higher pressure than Inside the dropper.
Q6. How does air pressure helps in sucking juice using a straw?
Ans.
When we sucks liquid through a straw, it creates an area of Low Pressure inside the straw. The pressure around the straw is Higher than the pressure inside the straw, which pushes the liquid into the straw.
Q4. Why do we not feel the pressure exerted by air around us?
Ans.
Because pressure acts equally on all sides of our body and is internally balanced by our body. So we don't feel the pressure of Air around us.
Q4. Design another experiment to show that air has mass?
Ans. Take one inflated balloon and one deflated balloon.
Stick them to the either end of the stick.
We see that the inflated balloon is lower than the deflated one.
It proves that inflated balloon has more mass than deflated balloon .
Q3. How will you prove that air Occupies Space?
Ans. The shape of a Balloon changes when we blow air into it. The air fills the space inside the balloon and causes it to expand and change its shape.
Q2. How do you know air is around us?
Ans. Earth is covered with a thick layer of Air. Air present all around us, we can feel it by moving our hand and when we walk.
Properties of Air:
The properties of Air are:
1. Air has weight
2. Air Occupies Space
3. Air exerts Pressure
