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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク pressure head ： ウィキペディア英語版 pressure head In fluid mechanics, pressure head is the internal energy of a fluid due to the pressure exerted on its container. It may also be called static pressure head or simply static head (but not static head pressure). It is mathematically expressed as: :$\backslash psi\; =\; \backslash frac\; =\; \backslash frac$ where :$\backslash psi$ is pressure head (Length, typically in units of m); :$p$ is fluid pressure (force per unit area, often as Pa units); and :$\backslash gamma$ is the specific weight (force per unit volume, typically N/m3 units) :$\backslash rho$ is the density of the fluid (mass per unit volume, typically kg/m3) :$g$ is acceleration due to gravity (rate of change of velocity, given in m/s2) Note that in this equation, the pressure term may be gauge pressure or absolute pressure, depending on the design of the container and whether it is open to the ambient air or sealed without air. ==Head equation== Pressure head is a component of hydraulic head, in which it is combined with elevation head. When considering dynamic (flowing) systems, there is a third term needed: velocity head. Thus, the three terms of ''velocity head'', ''elevation head'', and ''pressure head'' appear in the head equation derived from the Bernoulli equation for incompressible fluids: :$h\_\; +\; z\_\backslash text\; +\; \backslash psi\; =\; C\backslash ,$ where :$h\_$ is velocity head, :$z\_\backslash text$ is elevation head, :$\backslash psi$ is pressure head, and :$C$ is a constant for the system 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「pressure head」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.