एक स्थिर, असंपीड़ित और अघूर्णी (irrotational) तरल प्रवाह के लिए, वेग विभव फलन (velocity potential function) को किस समीकरण को संतुष्ट करना चाहिए?

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?