Cork Heavier Than Lead

Let a large piece of cork be pendent from one end of a balance beam,

and a small piece of lead from the other; the lead should rather

preponderate. If this apparatus be placed under a receiver on the

pump, you will find that when the air is exhausted, the lead, which

seemed the heaviest body, will ascend, and the cork outweigh the lead.

Restore the air, and the effect will cease. This phenomenon is only on

account of the difference of the size in the two objects. The lead,

which owes its heaviness to the operation of the air, yields to a

lighter because a larger substance when deprived of its assistance.

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