The falling stream of water becomes narrower, as the velocity of f stream of water increases and therefore its area of cross-s decreases.
Energy of a Liquid A liquid in motion possess three types of energy
( i) Pressure Energy
Pressure energy per unit mass = p / ρ where, p = pressure of the liquid and p = density of the liquid. Pressure energy per unit volume = p
( ii) Kinetic Energy Kinetic energy per unit mass =( 1 / 2v 2) Kinetic energy per unit volume = 1 / 2ρv 2
( iii) Potential Energy
Potential energy per unit mass = gh
Potential energy per unit volume = ρgh Bernoulli’ s Theorem
If an ideal liquid is flowing in streamlined flow then total energy, i. e., sum of pressure energy, kinetic energy and potential energy per unit volume of the liquid remains constant at every cross-section of the tube.