A pitot tube is a small, transparent, open tube bent at right angle. It is a hollow tube that is placed longitudinally in the direction of fluid flow, allowing the flow to enter one end at the fluids velocity of approach. When the fluids enter the pitot tube, it comes to a stop, all of the velocity head is converted to pressure head. The difference between the total and static energies is the kinetic energy of the fluid. The velocity of the fluid can be calculated by using the Bernoulli equation.