Question

why the fluid is said to be non viscous and incompressible​

Answer 1

Explanation:

Actually viscosity is the property of a fluid to resist internal friction. It actually relates to the thickness of the fluid. If we take an example of honey and milk. When you stir a spoon in two glasses, one full of milk and other full of honey, you will find out that honey is more thicker than milk. Therefore, it means that honey is more viscous than milk. Accordingly, the fluids that have no resistance or zero resistance to internal friction are known as non viscous fluids.

Now, we know basically that fluids at normal room temperature are incompressible. In incompressible fluid, the density of that fluid remains the same, even though there are changes in pressure.

Answer 2

Accordingly, the fluids that have no resistance or zero resistance to internal friction are known as non viscous fluids. Now, we know basically that fluids at normal room temperature are incompressible. In incompressible fluid, the density of that fluid remains the same, even though there are changes in pressure.