Explore how fluid flow is measured across the full velocity spectrum, from low-speed Pitot tubes to high-speed shockwave diagnostics. This video explains the principles behind Pitot and Pitot-static measurements, pressure differentials, and velocity calculation, then advances into compressible flow where Mach number, shock formation, and total pressure loss dominate accuracy. Learn where classical flow measurement breaks down, how shockwaves distort readings, and which techniques engineers use to measure flow reliably in high-speed and aerospace applications. Built for mechanical, aerospace, and fluid engineers seeking a clear, physics-based understanding of flow measurement limits and methods.