Quotation from: General Science

Written by: Bertha M. Clark


Matter of any kind can transmit sound to the ear. The following
experiments will show that matter is necessary for transmission.
Attach a small toy bell to a glass rod (Fig. 166) by means of a rubber
tube and pass the rod through one of two openings in a rubber cork.
Insert the cork in a strong flask containing a small quantity of water
and shake the bell, noting the sound produced. Then heat the flask,
allowing the water to boil briskly, and after the boiling has
continued for a few minutes remove the flame and instantly close up
the second opening by inserting a glass stopper. Now shake the flask
and note that the sound is very much fainter than at first. As the
flask was warmed, air was rapidly expelled; so that when the flask was
shaken the second time, less air was present to transmit the sound. If
the glass stopper is removed and the air is allowed to reenter the
flask, the loudness of the sound immediately increases.

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