Control valves are used to set the flow rate of air for gas burners.

该控制阀用于设定气体燃烧器空气流速。

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Air has a low density and great compressibility. The volumetric flow rate of air in air drilling varies with pressure and temperature, which in turn, change with WLL depth.

气体不仅密度低，而且具有很大的可压缩性，所以空气钻井的体积流量将随压力和温度变化，而压力和温度又随井深变化。

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This method is based on the measurement of the rate of air flow through a given area of fabric by a given pressure difference across the fabric.

这个方法是基于对空气流速的测量：在一块既定面积的面料上，通过面料两边不同的压差来获得。

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To this end, Aerovironment is working on a system of miniature gyroscopes and air-flow detectors to measure Black Widow's speed and rate of turn.

ECONOMIST: A personal eye in the sky