Answer :

Final answer:

A capillary tube is a thin rubber tube that uses capillary action to facilitate drainage or movement of liquids in narrow spaces, playing a role in biological processes and laboratory techniques.

Explanation:

The thin rubber tube that facilitates drainage by capillary action is commonly referred to as a capillary tube. This capillary action is an essential process in various biological and chemical applications. For example, it allows for the transport of water and nutrients in plants through xylem cells, and it is utilised in medical procedures such as blood sample collection. The effectiveness of capillary action is influenced by the interaction between the adhesive forces of the liquid and the material of the tube as well as the cohesive forces within the liquid itself. When a capillary tube is placed in a liquid and the diameter of the tube is sufficiently small, the surface tension and adhesive forces can lift the liquid against gravity.

Capillary tubes are crucial in laboratory techniques like thin layer chromatography, which separates mixtures based on their various rates of ascension on a thin layer medium. Additionally, they play a role in everyday bodily functions, such as the pumping away of tear fluid to keep our eyes lubricated.

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