668
1cal = 0.0039698Btu 1Kcal = 3.968Btu = 1000cal = 4186J
1N.m/s = 1W = 1J/S 1Kcal/h = 1.162W = 3.966Btu/h
1P = 100CP 纯水 = 1CP 机油 ? 110CP 蜂蜜 ? 1500CP