> Is there not a confusion between 'dimensionless' and 'unitless' ?? They > mean different things, and the sample equation is invalid because the > bracketed qualities are a mix of unit specification and dimension > specification.
yep - I think this is the crux of the issue. > The 10^-6 is dimensionless (being [length^3]/[length^3]) but has units > of L/uL. > > In terms of dimensions we have: > > amount_Na [amount_of_substance] = 10^-6 [dimensionless] * conc_Na > [amount_of_substance / length^3] * vol [length^3] > > With units: > > amount_Na [nmol] = 10^-6 [L / uL] * conc_Na [nmol / L] * vol [uL] > > Combining both units and dimensions: > > amount_Na [amount_of_substance (nmol)] > = 10^-6 [dimensionless (L/uL)] * conc_Na [amount_of_substance > (nmol) / length^3 (L)] * vol [length^3 (ul)] That looks good to me, and since CellML requires the specification of units it should be all the units included in the CellML model rather than the mix of dimensions and units. Andre. _______________________________________________ cellml-discussion mailing list cellml-discussion@cellml.org http://www.cellml.org/mailman/listinfo/cellml-discussion
