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Mechanical Properties Of Fluids

Question

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Large force is required to draw apart two glass plates enclosing a thin layer of water film. Explain why.

Solution

A thin film is formed between the glass plates. And this thin film has a concave surface all around as shown in the figure below:

The pressure on convex side is less than that on concave side because of surface tension.

i.e., p_i< p₀.

Therefore, there is net inward force on the plates due to difference of pressure and require some force to separate them.

Some More Questions From Mechanical Properties of Fluids Chapter

Can fluids withstand normal stress?

Why the fluids do not have any modulus of rigidity?

Which phase of fluid is more compressible?

What is an ideal liquid?

Do liquids exert pressure?

Define pressure.

What is the direction of pressure?

What is the direction in which pressure exerts force on the walls of a container?

What is the SI unit of pressure?

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