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In incompressible fluid dynamics dynamic pressure (indicated with ''q'', or ''Q'', and sometimes called velocity pressure) is the quantity defined by:〔Clancy, L.J., ''Aerodynamics'', Section 3.5〕 : or where (using SI units): : == Physical meaning == Dynamic pressure is the kinetic energy per unit volume of a fluid particle. Dynamic pressure is in fact one of the terms of Bernoulli's equation, which can be derived from the conservation of energy for a fluid in motion. In simplified cases, the dynamic pressure is equal to the difference between the stagnation pressure and the static pressure.〔 Another important aspect of dynamic pressure is that, as dimensional analysis shows, the aerodynamic stress (i.e. stress within a structure subject to aerodynamic forces) experienced by an aircraft travelling at speed is proportional to the air density and square of , i.e. proportional to . Therefore, by looking at the variation of during flight, it is possible to determine how the stress will vary and in particular when it will reach its maximum value. The point of maximum aerodynamic load is often referred to as ''max Q'' and it is a critical parameter in many applications, such as during spacecraft launch. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「dynamic pressure」の詳細全文を読む スポンサード リンク
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