Physics
Oil raise up the wick in a lamp. The principle involves

the liquid state of oil
volatility of oil
capillary action phenomenon
the diffusion of oil through the wick

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Physics
Stationary wave is formed by

Two waves of same frequency travelling in the opposite direction
Two waves of same frequency travelling in the same direction
A transverse wave superposing a longitudinal wave
Two waves of the same speed superposing

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