When a solid body is immersed in a flowing fluid, the narrow region in the immediate vicinity of the solid surface where the fluid velocity varies from zero to the free stream velocity is known as the:

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?