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Mechanical Properties of Fluids
Question
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You have two identical glass flasks. One is open mouthed and other is filled with helium and sealed. Which of the two will weigh more?

Answer

The open mouthed flask will weigh more because the atmospheric particles will get inside the flask which will be obviously heavier than the helium gas. 

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Some More Questions From Mechanical Properties of Fluids Chapter

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.

What is the direction of pressure?