GENERAL KNOWLEDGE

Detailed explanation-1: -The Mach Number is used in connection with speed. The Mach Number is the ratio of the speed of a body to the speed of sound in the undisturbed medium through which the body is traveling. Therefore when an aircraft is flying at Mach 1 if its speed is equal to the speed of sound in the air.

Detailed explanation-2: -Mach number is generally used to define the speed of aircrafts.

Detailed explanation-3: -Mach is used as a unit of measurement in stating the speed of a moving object in relation to the speed of sound. For example, if an aircraft is traveling at Mach 1, it is traveling at exactly the speed of sound. [technical]

Detailed explanation-4: -Definition. The ratio between the true air speed (TAS) and the local speed of sound (LSS). This ratio, which equals one when the TAS is equal to the LSS, is known as the Mach Number (M) and is very important in aircraft operating at high speed.

Detailed explanation-5: -The Mach number provides a comparison between fluid flow rate and the speed of sound. This metric is important in aerodynamics, as certain forces will increase as an aircraft approaches a critical Mach number. The critical Mach number can be determined from fluid flow simulation along the body of an aircraft.