velocity pressure
111Disk loading — The MV 22 Osprey tiltrotor has a relatively high disk loading, producing visible blade tip vortices from condensation of the marine air in this photo of a vertical takeoff …
112physical science, principles of — Introduction the procedures and concepts employed by those who study the inorganic world. physical science, like all the natural sciences, is concerned with describing and relating to one another those experiences of the surrounding… …
113de Laval nozzle — Diagram of a de Laval nozzle, showing approximate flow velocity (v), together with the effect on temperature (t) and pressure (p) A de Laval nozzle (or convergent divergent nozzle, CD nozzle or con di nozzle) is a tube that is pinched in the… …
114Darcy–Weisbach equation — In fluid dynamics, the Darcy–Weisbach equation is a phenomenological equation, which relates the head loss or pressure loss due to friction along a given length of pipe to the average velocity of the fluid flow. The equation is named after Henry… …
115Pelton wheel — The Pelton wheel is among the most efficient types of water turbines. It was invented by Lester Allan Pelton (1829 1908) in the 1870s, and is an impulse machine, meaning that it uses the principle of Newton s second law to extract energy from a… …
116Atmospheric reentry — refers to the movement of human made or natural objects as they enter the atmosphere of a planet from outer space, in the case of Earth from an altitude above the edge of space. This article primarily addresses the process of controlled reentry… …
117Outer space — For other uses, see Outer space (disambiguation). The boundaries between the Earth s surface and outer space, at the Kármán line, 100 km (62 mi) and exosphere at 690 km (430 mi). Not to scale Outer space is the void that exists beyond any… …
118Axial compressor — Axial compressors are rotating, aerofoil based compressors in which the working fluid principally flows parallel to the axis of rotation. This is in contrast with centrifugal, axi centrifugal and mixed flow compressors where the air may enter… …
119Paintball marker — A paintball marker, also known as a paintball gun, is the central or main piece of equipment in the sport of paintball. Markers make use of an expanding gas such as carbon dioxide, compressed air or nitrogen dioxide to propel paintballs through… …
120Wind — For other uses, see Wind (disambiguation). Wind, from the …
