
1) Air flow 2) Flow 3) Flow of air 4) Flowing 5) The flow of air
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https://www.crosswordclues.com/clue/airflow

In engineering, the airflow or air flow is a measurement of the amount of air per unit of time that flows through a particular device. The amount of air can be measured by its volume or by its mass. Typically it is measured by volume, but for some applications it is necessary to measure it by mass, as air is a gas and therefore its volume can vary...
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http://en.wikipedia.org/wiki/Airflow

An instrument used to measure the average fiber diameter of wool.
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[
n] - the flow of air
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http://www.webdictionary.co.uk/definition.php?query=airflow

A flow or stream of air. An airflow may take place in a wind tunnel, in the induction system of an engine, etc., or a relative airflow can occur, as past the wing or other parts of a moving craft; a rate of flow, measured by mass or volume per unit of time. See also: Aerodynamic Noise, Aerofoil.
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https://www.encyclo.co.uk/local/20687
air flow noun the flow of air; `she adjusted the fan so that the airflow was directed right at her`
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https://www.encyclo.co.uk/local/20974

the air flowing past or through a moving body, as an airplane or automobile.
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https://www.infoplease.com/dictionary/airflow
No exact match found.