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MACADAMIZED ROAD

A road whose surface is formed with broken stones of fairly uniform size rolled into a 15-25 cm 6-10 in layer, with gravel to fill the interstices. See tarmacadam

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MACARDLE'S DISEASE

An inborn error of metabolism leading to abnormal glycogen storage in the muscle and causing muscle pain and stiffness,

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MACERAL

The organic material which comprises coal. It includes exinite, inertinite and vitrinite.

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MACERATION

Grinding a raw material or mixture into a paste or slurry. A form of comminution,

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MACH ANGLE

In supersonic flow, the angle between the shock wave and the airflow, or line of flight, of the body. The cosecant of this angle is equal to the Mach number.

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MACH CONE

In supersonic flow, the conical shock wave formed by the nose of a body, whether stationary in a wind tunnel or in free flight through the air.

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MACH NUMBER

The ratio of the speed of a body, or of the flow of a fluid, to the speed of sound in the same medium. At Mach 1, speed is sonic: below Mach 1. it is subsonic; above Mach 1, it is suyersonic, creating a Mach or shock wave. Hyyersonic conditions in air are reached at A lach numbers exceeding 5. See speed of sound.

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MACH PRINCIPLE

The principle that scientific laws are descriptions of nature, are based on observation and alone can provide deductions which can be tested by experiment and/or observation,

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MACHICOLATION

A projecting gallery on a fortification which had a pierced floor through which boiling oil was poured on the enemy,

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MACHINABILITY

The ease with which a metal or alloy can be machined.

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