Physics
Siphon will fail to work if:

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.
The temperature of the liquids in the two vessels are the same.

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Physics
What is the principle of a ''Life Jacket"?

It provides oxygen to a drowning person
The person can sit on it like a raft
It decreases the volume of the person to keep him afloat
It increases the volume of the person to keep him afloat

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Physics
Conservation of energy refers to the fact that

Energy cannot be created or destroyed but can be converted from one form to another
The entropy of the universe is always increasing
No chemical reaction is 100 percent efficient
If you conserve energy you will not be as tired

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