static tube

American  

noun

1. a tube for measuring the static pressure of a fluid in motion, so placed in the fluid as not to be affected by the pressure changes caused by the motion of the fluid.

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static tube British  

noun

1. an open-ended tube used to measure the static pressure at a point in a moving fluid and positioned in such a way that it is unaffected by the fluid's motion

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Etymology

Origin of static tube

First recorded in 1930–35