> > Does anyone know an approximate density for liquid soap (i.e. palmolive dishwashing liquid)?
>
> Well, how approximate is okay?
>
> I just took a 2L bottle of "Jergens Skin Care Antibacterial Plus" liquid soap and stuck it on bathroom scale. It wasn't a full bottle; I estimate 350 mL has been removed from it. The bathroom scale read 5 lb.
>
> So that's 5 lb / 1.65 L (2L - 0.35 L). Since 1 lb = 0.45359237 kg, that's about 2.268 kg / 1.65 L, or about 1.37 kg/L (about a third more than the density of water).

Shouldn't you subtract the weight of the bottle?

Speed'of course if you are doing approximate it might not matter much'ball