Mach Number Calculator

M = V/a

M is the local Mach number,

V is the local flow velocity with respect to the boundaries (either internal, such as an object immersed in the flow, or external, like a channel),

a is the speed of sound in the medium, which in air varies with the square root of the thermodynamic temperature.

Mach number (M or Ma) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound – WIKIPEDIA

Classification of Mach Number
Classification of Mach Number

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