Sound travels about four times faster in water than in air.

Wacky WorldScience

Sound waves propagate through mechanical molecular vibrations. In freshwater at 20°C, sound travels at roughly 1,482 meters per second—more than four times faster than in air (approx. 343 m/s). Because liquid water has vastly higher bulk elastic modulus and intermolecular density than compressible gases, acoustic energy transfers significantly faster between tightly packed molecules.

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