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

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

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Physics
Conservation of energy refers to the fact that

No chemical reaction is 100 percent efficient
If you conserve energy you will not be as tired
Energy cannot be created or destroyed but can be converted from one form to another
The entropy of the universe is always increasing

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