100 cm
¾¾¾               1  m
  3 ft
¾¾¾             1  yd             
ØA Statement of Equality expressed as a   fraction or ratio
ØA relationship between different units   describing a single quantity
3 ft = 1 yd:
100 cm = 1 m:
1 μm = 10-6m:
  1 yd
¾¾              3 ft
or
   1 m
 ¾¾¾                        100 cm
or
1 μm
¾¾¾               10-6   m
   10-6   m
   ¾¾¾                           . 1 μm
or
Conversion-Factor
1 m
=
1000 mm