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Explain the following observation very briefly.
An empty glass in fact is not empty.
A large bowl is filled with water and the open mouth of an empty bottle is dipped into the water-filled bowl. In the position of the bottle, water does not enter into it due to the presence of . It prevented the from entering the bottle.
When the bottle is tilted sideways, the present inside the bottle goes out in the form of .
Thus, the entered the bottle by occupying the space inside. This proved that the empty glass in fact is not empty.
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