![]() Units Currently Accepted for Use with the SI System: NameĬalculation of number of kilometers in 20 miles:Ĭonversion factors a mile = 5280 ft, 1 ft = 12 in, 1 in = 2.54 cm, 1 m = 100 cm, 1 km = 1000 m.Ģ0 miles = 20 × 5280 ft = 20 × 5280 × 12 inches ![]() Units outside SI but Frequently Used in Physics: Name shake is used to measure very small time.Extremely small areas are measured in barn. ![]()
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