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. 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. So listen up and learn something or Hank might have to kill you! (NOT REALLY!) Like Crash Course? www.facebook.com/YouTubeCrashCourse Follow Crash Course! www.twitter.com/TheCrashCourse Follow ThoughtCafe! www.twitter.com/ThoughtBubbler Tumbl Crash Course. thecrashcourse.tumblr.com Table of Contents Unit Conversion 02:27 Scientific Notation 03:26 Sig Figs 07:40 Support CrashCourse on Subbable: subbable.com/crashcourse

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