Air: 343 m/s (1,235 km/h or 767 mph) at 20°C (68°F)
Water: 1,484 m/s (5,320 km/h or 3,336 mph) at 25°C (77°F)
Steel: 5,960 m/s (21,490 km/h or 13,350 mph)
Concrete: 4,000 m/s (14,400 km/h or 8,950 mph)
Human flesh: 1,540 m/s (5,540 km/h or 3,440 mph)
In general, sound travels faster through denser materials. This is because the particles in denser materials are closer together, so they can more easily transfer the sound vibrations.
