# Joseki units definition file

# (mole) fraction
@alias ppm = parts_per_million = ppmv
parts_per_billion = parts_per_billion = 1e-9 = ppb = ppbv
parts_per_trillion = 1e-12 = ppt = pptv

# column number density
dobson_unit = 2.687e20 * meter^-2 = du = dobson_units