Adding Imperial Units

>>> from PhysicalQuantities import imperial
>>> l = 1 inch
1 inch
>>> l.cm
2.54 cm

Name	Unit
inch	inch
ft	foot
yd	yard
mi \| (Br	itish) mile
nmi \| Na	utical mile
furlong	furlongs
acres	acre
barn	barn
tsp	teaspoon
tbsp	tablespoon
floz \|	fluid ounce
cup	cup
pt	pint
qt	quart
galUS	US gallon
galUK \| Bri	tish gallon
oz	ounce
lb	pound
ton	US ton
Btu \| Briti	sh thermal unit
hp	horsepower
psi \| pound	s per square inch
degF \| degre	e Fahrenheit