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 Originally developed during the French Revolution  Refined by the French Academy of Sciences in 1791 in a group that included Lavoisier and Laplace  In the Academy of Sciences can be found the perfect meter, and kilogram

 Time: Seconds  Length: Meter  Mass: Kilogram  Electric Current: Ampere  Temperature: Kelvin  Amount of Substance: Mole  Luminous intensity: Candela

 What are some different length measurements you have heard of?

 How do we calculate Volume?  What is the unit for volume?

 What is the difference between mass and weight?

 How have you calculated density in the past?  What is the unit for density?

 Kaytron found that his backpack was 1.34 m tall how tall was his backpack in mm?  Noah knows his mass is 45kg he wants to know how much his mass is in cg?

 Time is a special example