Physics
Supercooling is cooling of liquid ________

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

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Physics
Siphon will fail to work if:

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

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