【用戶】jane90191
【年級】高三下
【評論內容】Fisher subsieve sizer 氣體穿透法Air permeability 測粒子的表面積B. E. T. equation 氣體吸附法Air adsorption 測容積表面平均粒徑
【用戶】723700955
【年級】
【評論內容】A fisher sub sieve sizer uses air permeability method to measure the surface area of powders. But it does not stop at surface area. Calculated by equation, we got average particle size of such powder. A) is right, B) is wrong, cause it uses air permeability mehtod, C) is right casue by such principle a constant air pressure is a must, i.e. 50 cm water pressure, D) is also right cause before passing through the compact sample zone, the air must be dried by drier. Such machine is first made by Fisher Scientific in USA and now the most popular fisher sub sieve sizer is HMK-22 Fisher Sub Sieve S...
【用戶】1000060369497
【年級】高一上
【評論內容】粒子測量:過篩法(Sieving):平均粒徑顯微鏡法:投影粒徑沉降法(Sedimentation):史克當量粒徑(stokes diameter)柯特計數(Coulter Counters):體積、容積直徑(volume diameter)氣體穿透(Air permeability；Fisher subsieve sizer):比表面積氣體吸附(Air absorption；BET equation):容積表面平均粒徑