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"Under Pressure" Experiments

1. Air Pressure 1 (Balloon/Cup)  | 2. The Cartesian Diver  | 3. The Paper/Bottle Experiment  | 4. The Card and Glass Experiment

5. The Floating Ping Pong Ball  | 6. Floating Ball in a Cup!  | 7. Make a Barometer

Air Pressure 4

Experiment: To take another look at what air pressure can do.

Materials:

You will need:

A plastic cup or wine glass
A playing card
A 2c, 5c or 10c coin
 

Method:

What you have to do: 

1) Place the card on top of the cup or glass leaving a gap of about 2 cm.

2) Carefully place the coin on the edge of the card.

3) Now try to blow the coin off the card and into the glass/cup.

4) You will have a better chance of succeeding if you blow directly through the gap between the card and glass/cup - see diagram (a picture will follow).

Result: The card flips up and the coin falls into the glass/cup.

Conclusion: The pressure of the air entering the glass/cup causes the card to be pushed up and the coin to fall. 

Sixth Class Experiments