The time rate of change of displacement. This is often expressed as V, x, or dx/vt;

The speed of sonorous vibrations through gases varies inversely as the square root of the weights of equal volumes of the gases, or, in other words, in the inverse ratio of the square roots of their densities. (Appleton's School Physics, page 377)

See Also

**velocity**leads displacement by 90 degrees in time. Typical units for**velocity**are inches/second or millimeters/second, zero-to-peak.**Velocity**measurements are usually obtained with a mechanically activated velocity transducer and are used to evaluate machine housing and other structural response characteristics. Electronic integration of a**velocity**displacement signal. (Bentley Nevada Corporation, Field of Rotating Machinery Measurement, Monitoring and Analysis)**Velocity of Sound in Gas**The speed of sonorous vibrations through gases varies inversely as the square root of the weights of equal volumes of the gases, or, in other words, in the inverse ratio of the square roots of their densities. (Appleton's School Physics, page 377)

See Also

**9.12 - Velocity of Sound and its Propagation Rate are Proportional****9.2 - Wave Velocity Propagation Questions****Propagation****Snells Law****Table 9.1 - Velocity of Sound in various Materials****Velocity of Sound****Velocity Transducer**