Physics
Boyle's law is a relationship between

Volume and density
Pressure and temperature
Pressure and volume
Volume and temperature

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Physics
Siphon will fail to work if:

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

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