It will be to do with the density of oil. For instance, 1 cubic metre of water weighs one tonne, 1 litre of water weighs one kilogramme. So the volume calculation that Paul has given has the volume of the mould multiplied by 0.4 because I oil is heavier than water - also it's given in inches so that constant of 0.4 will account for the weight conversion to ounces.hey paul, thanks for the helpful thread!!..
just curious, where does the .40 come from??