The Floating Stone
To a piece of cork tie a small stone that will just sink it; and,
putting it in a vessel of water, place it under the receiver. Then
exhausting the receiver, the bubbles of air will expand from its
pores, and, adhering to its surface, will render it, together with the
stone, lighter than water, and consequently they will rise to the
surface, and float.
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Aerial Bubbles
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