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Definitions from WordNet

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Mach Number

Definition

A Mach number is a dimensionless quantity that represents the speed of an object, such as an aircraft or a projectile, in relation to the speed of sound in the surrounding medium.

Usage

As a noun:

The Mach number is commonly used in aerodynamics and aviation to describe the speed of aircraft.

Example sentence: The fighter jet was flying at Mach 2.5, surpassing the speed of sound.

As an adjective:

When referring to speeds, Mach number is used to denote supersonic or subsonic velocities.

Example sentence: The rocket achieved Mach speeds during its ascent into space.

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