Speed of Sound

The speed of sound is a level of speed generally considered a step below supersonic speed. But this isn't necessarily always true. Sound speed is variable depending on what it travels through, for example sound moves at 343.2 m/s in dry air at around 68°F at mach 1. This equates to traveling a kilometer in 2.9 seconds, or a mile in around five. But sound moving through water is several times faster than it is when traveling through air, (1,484 m/s) or fifteen times greater while moving through iron (5,120 m/s) And finally sound, being as it has to have something to travel through to move, has no speed in outer space.