Engineering
Physics
Surface Tension and Surface Energy
Question

Statement-1 : Pressure inside water-drop is more than that outside drop.
Statement-2 : Water molecules at the surface layer experience net inward force and hence all the water molecules on surface exert force on just inner layer molecules giving rise to a kind of volumetric compression.

Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1

Statement-1 is True, Statement-2 is False

Statement-1 is False, Statement-2 is True

Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1

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Solution
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Statement-1 is true. The pressure inside a water drop is indeed greater than the outside atmospheric pressure due to surface tension. This excess pressure is given by the formula P=2SR, where S is surface tension and R is the radius.

Statement-2 is also true and is the correct explanation. Surface molecules experience a net inward cohesive force, creating a state of tension. This force is exerted on the liquid just below the surface, compressing the interior and increasing the pressure.

Final Answer: Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1