Physics
Rise of oil a wick is due to

Density of the oil
Pressure of the oil
Surface tension of the oil
Viscosity of the oil

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Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Two thin shirts become thicker so prevent transmission of heat
Air layer between two shirts works as good conductor
Air layer between two shirts behaves like insulating media
No radiation of heat takes place

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