absolute pressure

velocity of fluid

flow

rotation

orifice plate

venturi

rotameter

pitot tube

the direction and magnitude of the veiocity at all points are identical

the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time

the magnitude and direction of the velocity do not change from point to point in the fluid

the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

Pascal law

Newton′s law of viscosity

boundary layer theory

continuity equation

constant

variable

zero

zero under limiting conditions