Pitot-static tube
American Heritage Dictionary:
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Pi·tot-stat·ic tube
(pē'tō-stăt'ĭk, pē-tō'-) 
n.
A device consisting of a Pitot tube and a static tube combined to measure simultaneously the total and static pressure in a fluid stream. It can be used in aircraft to determine relative wind speed.
n.
A device consisting of a Pitot tube and a static tube combined to measure simultaneously the total and static pressure in a fluid stream. It can be used in aircraft to determine relative wind speed.
McGraw-Hill Dictionary of Aviation:
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pitot-static tube
A combination tube used in a pitot-static system, located on the fuselage of the aircraft. It measures the total, or ram, pressure, as well as static pressure. The ram pressure is used for the ASI (air-speed indicator) and the Mach meter. The static system is used for the altimeter and the vertical speed indicator. It consists of a pitot head, which measures the total pressure of the airflow. Vents or small holes on the side of the tube are used to pick up static pressure. See pitot pressure.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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