申論 4砂糖（Granulated sugar）之平均粒徑為500 μm，當研磨成平均粒徑為25 μm 之粉糖（icing sugar）時，需12 hp（horse power，馬力）。如果要研磨成平均粒徑為15 μm 之翻糖（fondant sugar）時，請以Rittinger's law計算研磨輸出功率降低率（reduction in throughput）。（10 分）備註：Rittinger's law⎛11⎞E=K⎜−⎟⎜⎟R⎝dd⎠E(Wh-1 kg-1) : the energy required per mass of feedK：Rittinger's constantRd(m) : the average initial size of piecesd(m) : the average size of ground particles1 hp = 745.7 W