velocity

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

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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

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