1. Ideal fluid is incompressible and has no viscosity.2. Does this hold for an unsteady ideal fluid ? 3. Everything discussed here is based on the linear theory of an ideal fluid , cf. 4. Ideal fluid is only an imaginary fluid as all fluids that exist have some viscosity.5. In an ideal fluid this energy can never be dissipated and the vortex would persist forever. 6. An Ideal fluid is non-viscous and offers no resistance whatsoever to a shearing force. 7. An ideal fluid really does not exist, but in some calculations, the assumption is justifiable. 8. In contrast, ideal fluids can only be subjected to normal, compressive stress which is called pressure. 9. In some applications another rough broad division among fluids is made : ideal and non-ideal fluids . 10. The force was first modelled and analyzed for incompressible particles in an ideal fluid by King in 1934.
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