What characteristic makes the Pitot tube design effective for measuring fluid flow?

The effectiveness of the Pitot tube design for measuring fluid flow is attributed to its measurement of pressure at impact. Specifically, the Pitot tube operates on the principle of measuring the dynamic pressure of a fluid flow. When fluid enters the tube, it creates a difference between the static pressure and the dynamic pressure due to the fluid's velocity. This difference, known as the dynamic pressure, allows for the calculation of the fluid's flow velocity using Bernoulli's equation.

By accurately measuring the pressure exerted by the fluid as it impacts the tube, the Pitot tube can provide reliable and precise flow measurements. This design has been widely adopted in various applications, including aviation and fluid mechanics, due to its simplicity and effectiveness in determining fluid velocities.

The other choices do not accurately capture the primary function of the Pitot tube in measuring fluid flow. While filtering particles might be beneficial in some contexts, it is not a characteristic of the Pitot tube's design or function. The size of the opening is also not a significant factor in stroke calculation, as the Pitot tube's purpose is more about pressure measurement than volume flow. Finally, the material weight could influence installation but does not directly contribute to the tube's effectiveness in measuring fluid flow.