Physics
Bubbles of air rise up through liquids due to

Air current over the liquid and buoyancy
Viscosity and buoyancy
Up thrust and surface tension
Surface tension and adherence

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

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
It provides oxygen to a drowning person

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