258) In a convergent mouthpiece, the absolute pressure head at vena contracta is the same as that of the atmosphere.

259) Newton's law of viscosity is a relationship between

260) The pressure of air __________ with the increase of height from the surface of the earth.

261) The sheet of water flowing over a notch or a weir is known as

262) A body floating in a liquid is said to be not in equilibrium if its metacentre lies below its centre of gravity.