how do hot air balloons work science
In space there is a nearly complete vacuum so the air pressure is zero. The concept of expansion and contraction of air can be hard to visualize.
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A barometer measures air pressure.
. Watch the balloon expand and contract as the air around it changes temperature. Explore the effects of hot and cold air. On Earth because there are many miles of air molecules stacked up and exerting pressure due to the force of gravity the pressure is about.
A falling barometer indicates decreasing air pressure. A rising barometer indicates increasing air pressure. Experiment with balloons.
Thats where this experiment comes in to save the day. Learn how lungs work.
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