A unit is the frequently arbitrary designation we have given to something to convey a definite magnitude of a physical quantity and every quantity can be expressed in terms of the seven base units that are contained in the international system of units. Kelvin (temperature), second (time), metre or meter (length), kilogram (mass), candela (luminous intensity), mole (amount of substance) and ampere (electric current). Hank thinks this is a thrilling subject, and while you may not agree, it is a subject that is very important if you want to be a scientist and communicate with accuracy and precision with other scientists. Two reasons I like the episode of Crash Course: one Hank really simplify converstion of units to other units. Two Hank tells us that using light years instead of hours for speed would be so much more precise. -M
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