翻訳と辞書 Words near each other ・ Poros, Cephalonia ・ Poros, Grevena ・ Porosagrotis ・ Porosalvania ・ Porosalvania angulifera ・ Porosalvania decipiens ・ Porosalvania diaphana ・ Porosalvania hydrobiaeformis ・ Porosalvania profundior ・ Porosalvania semisculpta ・ Porosalvania solidula ・ Porosalvania vixplicata ・ Porosana ・ Poroschia ・ Poroshino ・ Porosimetry ・ Porosity ・ Porosity sealing ・ Porosity Storage Reservoir ・ Porosiuki ・ Porosome ・ Porosozero ・ Porosphaera ・ Porosphaerella ・ Porosporidae ・ Porost ・ Porosteognathus ・ Porostereum ・ Porostov ・ Poroszló Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Porosimetry ： ウィキペディア英語版 Porosimetry Porosimetry is an analytical technique used to determine various quantifiable aspects of a material's porous nature, such as pore diameter, total pore volume, surface area, and bulk and absolute densities. The technique involves the intrusion of a non-wetting liquid (often mercury) at high pressure into a material through the use of a porosimeter. The pore size can be determined based on the external pressure needed to force the liquid into a pore against the opposing force of the liquid's surface tension. A force balance equation known as Washburn's equation for the above material having cylindrical pores is given as:〔A.B. Abell, K.L. Willis and D.A. Lange, "Mercury Intrusion Porosimetry and Image Analysis of Cement-Based Materials", Journal of Colloid and Interface Science, 211, pp. 39-44 (1999). ()〕 :$P\_L\; -\; P\_G\; =\; \backslash frac$ :$P\_$ = pressure of liquid :$P\_$ = pressure of gas :$\backslash sigma$ = surface tension of liquid :$\backslash theta$ = contact angle of intrusion liquid :$D\_$ = pore diameter Since the technique is usually performed within a vacuum, the initial gas pressure is zero. The contact angle of mercury with most solids is between 135° and 142°, so an average of 140° can be taken without much error. The surface tension of mercury at 20 °C under vacuum is 480 mN/m. With the various substitutions, the equation becomes: :$D\_P\; =\; \backslash frac\}$ As pressure increases, so does the cumulative pore volume. From the cumulative pore volume, one can find the pressure and pore diameter where 50% of the total volume has been added to give the median pore diameter. ==See also== * Evapoporometry 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「Porosimetry」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.