1ml (= 1cm3) of ultrapure water weighs 1g.
Though for pipette calibrations, dye dilution methods are considered more
accurate (and more complicated).
Abizar
www.innogenex.com

Nick_Madary@hgsi.com wrote:

> Does anyone know the acceptable range of "weights of water" used when
> calibrating pipettes?  For example the weight of 500 ul should be.....
> I am sure the reference is right in front of me but poor ventilation has
> destroyed many neurons.