Sound voyages best in thick air on the grounds that the particles are near one another than in less thick air.
Since the air is compacted in the inflatable, the air atoms inside are nearer together than the air particles outside the inflatable.
In this way these atoms inside the inflatable can send the sound energy actually. Recollect sound waves are made by the transmission of the pressure and rarefaction by the air atoms.
This is additionally the motivation behind why solids are great transmitters of sound waves and other mechanical waves than air. The atoms of solids are more firmly stuffed than those of air.
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