Physics
Super cooling stands for cooling of a liquid :

At melting point
Below freezing point
At freezing point
Above melting point

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Physics
Siphon will fail to work if:

The level of the liquid in the two vessels are at the same height.
Both its limbs are of unequal length.
The temperature of the liquids in the two vessels are the same.
The densities of the liquid in the two vessels are equal.

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