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Mach
This term is used primarily in aeronautics and physics to describe speed relative to the speed of sound. It is a dimensionless quantity, meaning it is a ratio rather than a unit with a fixed value like miles per hour, because the speed of sound varies depending on the medium and temperature.
In common usage, it is often treated as a proper noun because it is named after Ernst Mach. When used as a modifier, such as in "Mach speed" or "Mach 3 aircraft," it functions as an attributive noun.
Meanings
Examples
The missile travels at Mach 5, making it a hypersonic weapon.
Breaking the Mach barrier was a monumental achievement in aviation.
Breaking the Mach barrier was a monumental achievement in aviation.
I wonder if the pilot felt the shock when hitting Mach 1.
The spacecraft must maintain a specific Mach number to avoid overheating.
The spacecraft must maintain a specific Mach number to avoid overheating.
It is nearly impossible for a commercial plane to reach Mach 2.
It is nearly impossible for a commercial plane to reach Mach 2.