A very thin tube with a hair-like inner diameter, such as those used to measure melting points or collect micro-samples of liquid

the phenomenon where liquid rises or falls in a thin tube or porous material due to surface tension; also known as capillarity

pore of the skin

Capillary action; the phenomenon where liquid rises in a thin tube due to surface tension and adhesion

Tiny blood vessels that connect arteries to veins and allow for the exchange of nutrients and waste between blood and body tissues