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Mechanical Properties of Fluids
Question
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Straws are used to take soft drinks. Why?

Answer

Straws make use of the capillary action as a result of the difference in pressure.

When a person suck though the straw, pressure inside the straw decreases and due to the difference in pressure outside and inside the straw, the liquid rises in the straw. 

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Some More Questions From Mechanical Properties of Fluids Chapter

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.

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?