The continuity equation ρ1A1V1 = ρ2A2V2 is based fundamentally on the assumption of ______ (where ρ represents density, A represents area, and V represents velocity).

The ratio of the specific weight of a liquid to the specific weight of a standard fluid is known as:

The magnitude of the buoyant force depends on the _____________.

In incompressible fluid dynamics, the continuity equation is ∂u/∂x + ∂v/∂y + ∂w/∂z = 0. What physical law does this equation represent?