So here goes this question... maybe again...

I have found already a couple of fellas pointing out towards online and software volume calculators that allow to calculate the mash final volume (i.e. grist + strike water).

My question here is... does anyone know the theory behind it?

To cite one example, I used "

http://www.rackers.org/calcs.shtml" under "Can I Mash it?" and fed the following info...

360 kgs grist

2.5 l/kg grist

Total Volume = 1141,2 Liters

In theory, with the aforementioned water/grist ratio I should use 900 Liters of water. Then, if I do a simple calculation it turns out to be that grist amounts to 0.67 liters in volume per kilo of grist.

Does anybody know a good reference/theoretical background for this? or Have you found similar values in your mashing procedures?

Cheers!