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Which is not true for continuity equation of normal shock?

Which is not true for continuity equation of normal shock? Correct Answer ρ1u1=ρ2u2

The continuity equation of the normal shock equation is derived from the continuity equation of mass and is given as ρ1u1A1=ρ2u2A2. If the area of the control volume is same on both sides, it becomes ρ1u1=ρ2u2. The flow is steady and without viscosity.

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