hour = min * 60 = h = [time] # override plank length default
# pH = log10_concentration_Hplus = log [concentration]
pH = log10_concentration_Hplus
postnatal_day = day = P = days_since_birth = [time]
fold = x = []  # FIXME not a multiplicative unit ...
numerical_aperture = NA = []
bel = []
degrees_celsius = degC = degrees-celsius
percent = 0.01 * count = %
osmole = [substance_particles] = Osm  # this is quite complicated to calculate from first principles since it is actual particles
osmolarity = Osm / liter
molarity = molar

# for U -> kat see
# Wharton, Christopher W.; Eisenthal, Robert (2013), Molecular Enzymology,
# Tertiary Level Biology, Springer Science and Business Media, p. 82, ISBN 9781461585329.
enzyme_unit = μmol / min = 1 / 60 μmol / s = 100 / 6 nkat = enzyme-unit = U

@system mgs using international
    meter
    gram
    second
@end
