Physics
Which best describes how air moves during convection?

Cool air is replaced by warm air
Air always falls down
Warm air falls down
Cool air falls down

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Physics
Siphon will fail to work if:

Both its limbs are of unequal length.
The temperature of the liquids in the two vessels are the same.
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.

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