Experiment showing that the bladder swells up in the vacuum.
Saggi di naturali esperienze fatte nell'Accademia del Cimento, Florence 1666

Particularly spectacular and convincing results are produced by the vacuum in the bell-jar, such as the mysterious swelling up of bladders which have been previously emptied of air. The small amount of air remaining in them was enough to blow them up, in the absence of atmospheric pressure. By reintroducing air into the bell-jar, the bladders go down again.

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