Physics
Which set of conditions represents the easiest way to liquify a gas ?

Low temperature and high pressure
High temperature and low pressure
High temperature and high pressure
Low temperature and low pressure

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Physics
Siphon will fail to work if:

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.
The densities of the liquid in the two vessels are equal.
Both its limbs are of unequal length.

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