Apple iWork '09 - Manual (Page 80)

Supported Conversion Units
Weight and mass
Measure Constant
Gram “g” (can be used with metric prefixes)
Slug “sg”
Pound mass (avoirdupois) “lbm”
U (atomic mass unit) “u” (can be used with metric prefixes)
Ounce mass (avoirdupois) “ozm”
Distance
Measure Constant
Meter “m” (can be used with metric prefixes)
Statute mile “mi”
Nautical mile “Nmi”
Inch “in”
Foot “ft”
Yard “yd”
Angstrom “ang” (can be used with metric prefixes)
Pica (1/6 in., Postscript Pica) “Pica”
Duration
Measure Constant
Year “yr”
Week “wk”
Day “day”
Hour “hr”
Minute “mn”
Second “sec” (can be used with metric prefixes)
80 Chapter 5 Engineering Functions