FOOT :=
INCH:=FOOT/12
MIL:=1/1000*INCH
YARD:=3*FOOT
FATHOM:=6*FOOT
ROD:=33/2*FOOT
MILE:=5280*FOOT
FURLONG:=MILE/8
LEAGUE:=3*MILE
ACRE:=MILE^2/640
GALLON:=231*INCH^3
QUART:=GALLON/4
PINT:=QUART/2
BARREL:=63/2*GALLON
POUND :=
OUNCE:=POUND/16
TON:=2000*POUND
SECOND :=
MINUTE:=60*SECOND
HOUR:=60*MINUTE
DAY:=24*HOUR
WEEK:=7*DAY
FORTNIGHT:=2*WEEK
YEAR:=1826211/5000*DAY
DECADE:=10*YEAR
CENTURY:=100*YEAR
METER:=1250/381*FOOT
GRAM:=100000/45359237*POUND
