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Science Lab Experiment: Air Pressure


Demonstration: Air Pressure

Object: To find out how gases affect pressure.

Materials: bell jar, glass tubing, one-holed stopper, rubber sheeting, balloons, elastic

Diagram:
air pressure lab setup

air pressure lab setup


Method: The balloons were observed when the rubber sheeting was pulled downward and when released.

Observations: It was noted that as the rubber sheeting was pulled downward, the balloons filled with air. When the sheeting was released, the balloons emptied.

Conclusions: The air in the jar remained constant, but when the sheeting was moved downward that air increased in volume, thus having less force on the balloons. The outside air rushed down the glass tubing and filled the balloons. In our bodies the DIAPHRAGM moves down and air rushes down the windpipe to fill the lungs.

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