Back to SI. There are, what're called, derived units formed by powers, products or quotients of the base units #SundayScience— Sivakumar Surampudi (@S_Sivakumar) March 5, 2017
For example, velocity is derived from time and length, so the derived unit is metres per second (symbol m/s) #SundayScience— Sivakumar Surampudi (@S_Sivakumar) March 5, 2017
For the sake of convenience, some derived units have special names and symbols #SundayScience pic.twitter.com/6hBCuC5j4L— Sivakumar Surampudi (@S_Sivakumar) March 5, 2017