plz clear my sci doubt
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Fluid :- Substance which can able to flow is called fluid.
Or, the substance which can't resist the shearing force acting on it(i.e it's shear modules is zero ) is called fluid.
example :- liquid and gasses .
We usually use ideal fluid in many cases,
Ideal(imaginary) fluid :- the fluid which can't compressible and non - viscous (means he particular talking about liquid because gas are compressible).
Substance :-
A particular kind of matter with uniform properties.
example :- copper rod , fluid , gold , table
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