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capillary tube

British  

noun

  1. a glass tube with a fine bore and thick walls, used in thermometers, etc

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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But they lived when Dr. Snir whisked the fluid away with a capillary tube.

From New York Times Nov. 30, 2022

What is the diameter of the capillary tube?

From Textbooks Feb. 14, 2019

Water rises in a glass capillary tube to a height of 17 cm.

From Textbooks Feb. 14, 2019

At the end of Beam Line 12, a scientist named Helen He showed off the object being scrutinized: a crystal inside a capillary tube, almost too small to see with the naked eye.

From Washington Post Apr. 17, 2017

Capillary attraction or repulsion is the cause which determines the ascent or descent of a fluid in a capillary tube.

From The Chemical History of a Candle by Sir William Crookes

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