Question

Capillary action takes place when a tube with very small diameter (capillary) is placed on a liquid surface. The adhesive forces between ink and the walls of cartridge forces the liquid to climb those walls.

Answer 1

capillary action is the ability of a liquid to flow in narrow spaces without the assistance of or even in opposition to external forces like gravity. the effect can be seen in the drawing up of liquid between the hairs in the paint brush of a thin tube in porous material such as paper and plaster, in some non porous materials such as sand and liquified carbon fibre or in a cell.
it occurs because of intermolecular forces between the liquid and surrounding solid surfaces.if the diameter of the tube is sufficiently small then the combination of surface tension and adhesive forces between the liquid and the container will act to propell the liquid.
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