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The specific weight (also known as the unit weight) is the weight per unit volume of a material. The symbol of specific weight is γ (the Greek letter Gamma). A commonly used value is the specific weight of water on Earth at 5°C which is 9.807 kN/m3 or 62.43 lbf/ft3. 〔 National Council of Examiners for Engineering and Surveying (2005). Fundamentals of Engineering Supplied-Reference Handbook (7th ed.). Clemson: National Council of Examiners for Engineering and Surveying. ISBN 1-932613-00-5 〕 The terms ''specific gravity'', and less often ''specific weight'', are also used for relative density. ==General formula== : where : is the specific weight of the material (weight per unit volume, typically N/m3 units) : is the density of the material (mass per unit volume, typically kg/m3) : is acceleration due to gravity (rate of change of velocity, given in m/s2, and on Earth usually given as 9.81 m/s2) 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「Specific weight」の詳細全文を読む スポンサード リンク
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