Metric Length

1
Metric Length

• E.Q. How can we use the metric system to
  measure length?

2
In the beginning.

• cubit' - the length of the arm from the tip of
  the finger to the elbow
• foot, hand (which at 4 inches is still used today
  for expressing the height of horses

The cubit could vary considerably due to the
different sizes of people.
3
Early Yardstick

• As early as the middle of the tenth century it is
  believed that the Saxon king Edgar kept a
  "yardstick" at Winchester as the official
  standard of measurement.

The yardstick (Henry I, thumb to nose).
4
Which is Longer?

• Mile or Kilometer
• mile
• Yard or meter
• meter
• Inch or centimeter
• inch

5
Complete each statement.

• Mile or Kilometer
• mile 1.61 km
• Yard or meter
• yard 0.9144 m
• Inch or centimeter
• inch 2.54 cm

6
Assize of Measures

• In the Assize of Measures in 1196 it was stated
  that "Throughout the realm there shall be the
  same yard of the same size and it should be of
  iron".

7
Metric Base Unit for Length

• The basic unit of length in the metric system is
  the _____ and is represented by a lowercase _.

meter
m
8
What exactly is a meter today?

• The meter is defined as the ________ traveled by
  _____ in absolute vacuum in 1/299,792,458 of a
  second.

distance
light
9
Find out more about the history of standard
length measurement

• Visit http//www.npl.co.uk/educate-explore/poste
  rs/history-of-length-measurement/
• Fin