This quantity is roughly constant along a streamline when the Mach number is less than 0.3.
This quantity is roughly constant along a streamline when the Mach number is less than 0.3. When this quantity doesn't change within a fluid, the continuity equation in the Euler equations has only one term. Dynamic viscosity is divided by this quantity to give the kinematic viscosity. The only term in the Bernoulli equation which is not multiplied by this quantity is the pressure term. When this quantity is constant (*) throughout a fluid, the fluid is incompressible. The buoyant force on an object is proportional to this quantity times the volume the object displaces. The ratio of this quantity for any fluid to this quantity for water is called specific gravity. For 10 points, kilograms per meter cubed are the units of what quantity defined as mass over volume?
This quantity is roughly constant along a streamline when the Mach number is less than 0.3.
mass density