sound velocity
Sound propagates at a certain speed, the speed of sound. This depends on the medium in which it is transmitted and its temperature. The speed of sound is given in meters per second (m/s).
The fact that the speed of propagation differs in different media and at different temperatures is causally related to the molecular motion that ensures the propagation of sound.
Airborne sound propagates from a sound source in a spherical form by compression and rarefaction of the air. The compression corresponds to an increased sound pressure, the dilution to a decreased one. In air, the speed of sound at freezing point is 331 m/s relative to an air pressure at sea level.
At high minus temperatures, high humidity and in higher air layers it decreases, even below 300 m/s. In water, the speed of sound is 1.4 km/s and in iron 5.1 km/s.