+1 vote
in Fluid Mechanics by (118k points)
In which type of matter, one won’t find a free surface?

(a) Solid

(b) Liquid

(c) Gas

(d) Fluid

This question was addressed to me in exam.

I'd like to ask this question from Introduction to Fluid Mechanics topic in section Properties of Fluids of Fluid Mechanics

1 Answer

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by (362k points)
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Best answer
The correct option is (c) Gas

The explanation: Solid molecules have a definite shape due to large inter-molecular forces. In liquids, molecules are free to move inside the whole mass but rarely escape from itself. Thus, liquids can form free surfaces under the effect of gravity. But, in case of gases, molecules tend to escape due to low forces of attraction. Thus, gases won’t form any free surface.

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