Oil rises up the wick in a lamp The principle involves........

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Oil rises up the wick in a lamp. The principle involves

the diffusion of oil through the wick

the liquid state of oil

capillary action phenomenon

volatility of oil

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Explanation:

Oil rises up the wick in a lamp. The principle involves capillary action phenomenon.
Capillary action (sometimes capillarity, capillary motion, or wicking) is the ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.