as.unit(u, default = list(unit = expression(), scale = ""))"DBAR",
"IPTS-68", "ITS-90", "PSS-78", and "UMOL/KG".
All other names yield a return value equal to the value of the
default argument.u
is not a recognized string.unit, an expression,
and scale, a string.
oce functions, and is
provided as a convenience function for users.