<P> A Pitot ( / ˈpiːtoʊ / PEE - toh ) tube , also known as Pitot probe , is a flow measurement device used to measure fluid flow velocity . The pitot tube was invented by the French engineer Henri Pitot in the early 18th century and was modified to its modern form in the mid-19th century by French scientist Henry Darcy . It is widely used to determine the airspeed of an aircraft , water speed of a boat , and to measure liquid , air and gas flow velocities in certain industrial applications . The pitot tube is used to measure the local flow velocity at a given point in the flow stream and not the average flow velocity in the pipe or conduit . Errors induced due to the location of the measuring tube on the aircraft , and the effect of localised airflow upon it , are known as `` position errors '' and need to be factored into resultant calculations . </P>
<P> A Pitot ( / ˈpiːtoʊ / PEE - toh ) tube , also known as Pitot probe , is a flow measurement device used to measure fluid flow velocity . The pitot tube was invented by the French engineer Henri Pitot in the early 18th century and was modified to its modern form in the mid-19th century by French scientist Henry Darcy . It is widely used to determine the airspeed of an aircraft , water speed of a boat , and to measure liquid , air and gas flow velocities in certain industrial applications . The pitot tube is used to measure the local flow velocity at a given point in the flow stream and not the average flow velocity in the pipe or conduit . Errors induced due to the location of the measuring tube on the aircraft , and the effect of localised airflow upon it , are known as `` position errors '' and need to be factored into resultant calculations . </P>
what is used to measure the speed of a stream
what is used to measure the speed of a stream
Pitot probe pitot tube
Pitot probe pitot tube