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1. Paheli kept an empty bottle made of plastic inside a refrigerator. After few hours, when she opened the refrigerator she found the bottle had collapsed. Explain the possible reason?
Due to inside the refrigerator, the air inside the plastic bottle and hence it due to the pressure.
2.When strong/high speed wind blows, an umbrella held upright at times gets upturned. Explain the reason.
Umbrella gets upturned at times because of the created by the blowing through the umbrella.
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