Pressure in a Fluid
Given below are two statements:
Statement I: Pressure of a fluid is exerted only on a solid surface in contact as the fluid-pressure does not exist everywhere in a still fluid.
Statement II: Excess potential energy of the molecules on the surface of a liquid, when compared to interior, results in surface tension.
In the light of the above statements, choose the correct answer from the options given below
Show answer and solution
Answer: (a)
- Statement I: pressure exists at every point inside a fluid at rest, not only on solid surfaces, so it is false.
- Statement II: surface molecules have extra potential energy compared with interior ones; this surface energy per unit area is surface tension, so it is true.
- So the answer is (a).