Underwater Sound

Sound travels best in dense mediums because of the more closely packed molecules. Water, which is denser than air, transmits sound better. The speed of sound increases by about four times underwater. Since sound travels so fast underwater, direction from which a sound originated, cannot be very well ascertained. Likewise voices cannot be heard underwater well. This is due the fact sound from air does not penetrate water well, nor does underwater sounds travel into the air.

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