Can fluids withstand normal stress?

Force is applied normal to it's cross-sectional area. The restoring force per unit area in this case is known as normal stress.

Fluids can withstand normal stress. 
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Can fluids withstand tangential stress?

The restoring force per unit area due to the application of equal and opposite deformation force applied parallel t the cross-sectional area of the cylinder is known as tangential stress.

Fluids cannot withstand tangential stress. 
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Why the fluids do not have any modulus of rigidity?

Fluids cannot withstand tangential stress, therefore fluids do not have any modulus of rigidity.
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What is an ideal liquid?


A liquid is said to be ideal if:

i) It is incompressible,
ii) It is non-viscous, and 
iii) It's flow is steady. 
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Which phase of fluid is more compressible?

The intermolecular force of attraction in gas molecules is weak. So, sas phase is more compressible.
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