Physics
A gap is left between two rails of a railway track to accommodate...... of the metal.

Apparent expansion
Linear expansion
Volume expansion
Areal expansion

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Physics
Siphon will fail to work if:

Both its limbs are of unequal length.
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.

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