STEM (Air Pressure in a dropper) Exploring Air & Air Pressure

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Experiment-1
Aim:
To observe the air pressure in a dropper.

Things needed:
A dropper and colourful water or ink.

Method:
1. Press the bulb of the dropper.
2. Lower the dropper in colourful water, keeping the bulb pressed.
3. Now release the bulb.
Observation:

Water is sucked up into the tube of the dropper.

Conclusion:
When the bulb is pressed air goes out of the dropper. When it is released in water, the air pushes the colourful water into the dropper.

Experiment-2
How can we prove that air has weight ? Show with an experiment.
Ans:

We can prove that air has weight by the following experiment

Aim:

To prove that air has weight.

Things required:

I) a beam balance ii) two balloons iii) strings

iv) a sharp needle

Procedure: I) we blow two balloons until they are equal in size and tie

ii) we attach the balloons to the balance as shown in the figure.

iii) We make sure that the balance is perfectly horizontal.

iv) We prick one balloon with a needle near the tie and observe what happens to the balloon and the balance.

Observation: When we prick one of the balloons with a needle the balance will till towards the inflated balloon. Because the balloon still has air inside it and is heavier than the deflated balloon.

Result: From this experiment, we come to know that air has weight.

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