Physics
The density of a gas is maximum at

High temperature, low pressure
Low temperature, high pressure
High temperature, high pressure
Low temperature, low pressure

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Physics
Siphon will fail to work if:

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

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