The Pitot-static tube is a device used to measure fluid flow velocity, particularly in air and gases. It works based on the principles of Bernoulli’s equation and involves two pressure measurements, the stagnation pressure (total pressure) and the static pressure. By comparing these pressures, the velocity of the fluid can be determined. The Pitot-static tube equation is derived from Bernoulli’s equation and is given by,

Where:

• $V$ is the fluid velocity,
• P0​ is the stagnation pressure measured at the tip of the Pitot tube,
• Ps​ is the static pressure measured at a point away from the flow disturbance caused by the tube,
• $\rho$ is the fluid density.