In a two-dimensional incompressible fluid flow, the components of velocity are given by u = ax and v = -ay (where a is a constant). The stream lines for this flow will be:

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?