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Mechanical Properties of Fluids
Question
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Why does the oil spread over the water?

Answer

Surface tension of oil is less than water, therefore, oil spreads over water and do not mix with each other. 

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Some More Questions From Mechanical Properties of Fluids Chapter

What is fluid?

What is hydrostatics?

What is hydrodynamics?

Can fluids withstand tangential stress?

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.