def foot 12 inch
def mile 5280 foot
def inch 0.0254 meter
def hour 60 minute
def minute 60 second
def mph 1 mile / hour
def coulomb 1 ampere second
def joule 1 kg meter meter / second second
def ohm 1 volt / ampere
def volt 1 joule / coulomb
def watt 1 joule / second
def hz 1 / second
def yard 3 foot
def furlong 0.125 mile
def day 24 hour
def fortnight 14 day
def point inch / 72
