EVERYDAY SCIENCE

Detailed explanation-1: -A machmeter is an instrument which provides an indication of the Mach Number, (M), which is the ratio between the aircraft true air speed (TAS) and the local speed of sound (LSS). This ratio, which equals one when the TAS is equal to the local speed of sound, is very important in aircraft operating at high speed.

Detailed explanation-2: -An air speed indicator (ASI) is a device for measuring the forward speed of the aircraft. The ASI uses the aircraft pitot-static system to compare pitot and static pressure and thus determine forward speed.

Detailed explanation-3: -In the case of an object moving through a fluid, such as an aircraft in flight, the Mach number is equal to the velocity of the object relative to the fluid divided by the velocity of sound in that fluid.

Detailed explanation-4: -A machmeter is an instrument that measures the ratio of an aircraft’s true air speed (TAS) in relation to the speed of sound. When the TAS is equal to the local sound speed, the ratio becomes one. This ratio is denoted as Mach number, a dimensionless quantity.

Detailed explanation-5: -Based on the speed that sound travels. Mach expresses the speed of a rocket and the like. When Mach is “1”, it is the same as the speed of sound. Its cool-sounding name derives from the name of Ernst Mach, the first physicist to use this unit.