Meaning & use
capillary tube
A very narrow tube with a fine internal diameter, used to draw up or measure small amounts of liquid.
See it in a sentence
The technician filled a capillary tube with blood for the test.
Capillary tubes are used in refrigeration systems to control the flow of refrigerant.
A note on using this word
Capillary tubes rely on capillary action, the tendency of liquid to rise in a narrow space without external force.
Words with a similar meaning
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