एक मुक्त भंवर प्रवाह (free vortex flow) में, एक द्रव कण का स्पर्शरेखीय वेग (tangential velocity) होता है:

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?