Mach number

Noun

uncountable

(physics) The ratio of the velocity of a body to that of sound in the surrounding medium.

Japanese Meaning

ある物体の速度と、その物体が存在する媒体における音速との比率

The aircraft's Mach number increased rapidly during the climb, approaching transonic speeds.

上昇中、航空機のマッハ数は急速に増加し、遷音速に近づいた。

Sense（1）

(physics) The ratio of the velocity of a body to that of sound in the surrounding medium.