ppmKK [ˋpiˋpiˋɛm] /ˈpiˈpiˈɛm/發音名詞1百萬分之一、百萬分率縮寫The water sample contained only two ppm of lead.這份水樣中的鉛含量只有百萬分之二。2每分鐘列印頁數縮寫,電腦This laser printer runs at about thirty ppm in black and white.這台雷射印表機的黑白列印速度約為每分鐘三十頁。