Air Pressure

ATMOSPHERIC PHENOMENON AND AIR TEMPERATURE by Denise Peterson

INVESTIGATION E: AIR PRESSURE

OBJECTIVE: The students will demonstrate that air flows from a high pressure area to a low
pressure area (pressure gradient).

MATERIALS: 2 plastic bottles
                         scissors
                         food coloring
                         modeling clay
                         tape
                         plastic tube
                         hand drill and bit
                         water

PROCEDURE: 1. Drill a small hole near the bottom of each bottle (same position on each)
                           and then cut off the top of each bottle.
                           2. Seal the edges of bottles with tape.
                           3. Stick strips of tape at equal intervals on both bottles to make a rough scale.
                           4. Connect the 2 bottles by placing the ends of the plastic tube in the holes,
                           use modeling clay to seal the joints.
                           5. Fill one bottle with colored water to the level of the tube, and fill the other bottle
                           completely.
                           6. Observe.

OBSERVATIONS:

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CONCLUSIONS:

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REFERENCES:

Reader's Digest: How the Weather Works, Dorling Kindersley Limited, London,
1995, page 57.

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