जब कोई तरल द्रव्यमान बिना किसी बाहरी बल के प्रभाव के घूमता है, तो इस गति को क्या कहा जाता 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?