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REASONS FOR THE METRIC SYSTEM

REASONS FOR THE METRIC SYSTEM. a.k.a. INTERNATIONAL SYSTEM OF UNITS or SI System (Le Systeme International d ’ Unites). 1. Used world wide. 95% of the world ’ s population already uses it. 2. Based on multiples of 10. Easy to remember conversions

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REASONS FOR THE METRIC SYSTEM

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  1. REASONS FOR THE METRIC SYSTEM a.k.a. INTERNATIONAL SYSTEM OF UNITS or SI System (Le Systeme International d’Unites)

  2. 1. Used world wide • 95% of the world’s population already uses it

  3. 2. Based on multiples of 10 • Easy to remember conversions • Easy to calculate conversions between units (just move the decimal)

  4. 3. Based on unchanging standards • What is the length of the original foot, inch and yard? • How was the length of the meter determined? 1/4 of the Earth’s circumference divided by 10,000,000 = 1 meter What’s the circumference of the Earth in meters?

  5. 4. Interrelated Units • Units of length use to determine units of volume (volume = l x w x h) • 1cm x 1cm x 1cm = 1cm3 • 1cm3 = 1mL (1 inch3 = 0.55 ounces)? • Units of volume use to determine units of mass • 1mL of pure water = 1 g (1 fluid oz. = 1.04 oz.) • 1 L of pure water = 1 kg (1 gallon = 8.57 lb)

  6. Medieval English 'doubling' method for measuring volumes Two mouthfuls* are a jigger; two jiggers are a jack; two jacks are a gill**; two gills are a cup; two cups are a pint; two pints are a quart; two quarts are a pottle; two pottles are a gallon; two gallons are a pail; two pails are a peck; two pecks are a bushel; two bushels are a strike; two strikes are a coomb; two coombs are a cask; two casks are a barrel; two barrels are a hogshead; two hogsheads are a pipe; two pipes are a tun; and there, my friend, my story is done! * It's probably best to avoid cooks who use mouthfuls as measures! ** a gill was often pronounced jill.

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