Wright, Mark R., 1854- · London : Longmans · leaf 66
Fig. 43- Fig. 44. The sound is louder than that produced in the vacuum, butfeebler than when the flask was full of air. If filled with hy-drogen, the sound is feebler than with coal gas; on the contraryif filled with carbonic acid gas the sound is louder. Coal gasand hydrogen are lighter than air,…
Physics
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