TERA:=10^12
GIGA:=10^9
MEGA:=10^6
KILO:=1000
HECTO:=100
DECA:=10
DECI:=1/10
CENTI:=10^(-2)
MILLI:=10^(-3)
MICRO:=10^(-6)
NANO:=10^(-9)
PICO:=10^(-12)
METER :=
MICRON:=MICRO*METER
ANGSTROM:=10^(-8)*CENTI*METER
ARE:=100*METER^2
HECTARE:=HECTO*ARE
LITER:=METER^3/1000
GRAM :=
METRIC_TON:=1000*KILO*GRAM
CARAT:=200*MILLI*GRAM
SECOND :=
MINUTE:=60*SECOND
HOUR:=60*MINUTE
DAY:=24*HOUR
WEEK:=7*DAY
YEAR:=1826211/5000*DAY
DECADE:=10*YEAR
CENTURY:=100*YEAR
NEWTON:=KILO*GRAM*METER/SECOND^2
DYNE:=10^(-5)*NEWTON
JOULE:=NEWTON*METER
ERG:=10^(-7)*JOULE
WATT:=JOULE/SECOND
FOOT:=381/1250*METER
POUND:=45359237/100000000*KILO*GRAM
