Many Fermentations

In many fermentations it is necessary to obtain a maximum amount of biomass, therefore, the amount of mass that can be obtained is limited by the volume of cells, these occupy a finite volume and have a rigid shape, so they cannot pack more than
a certain limit.

There will always remain a certain amount of water in the interstitials between
adjacent cells, even if they have the volume of hollows that in most cases
can reduce up to 40% of the volume of the fermenters. Calculate the maximum cell mass
on a dry basis that can be obtained for each liter of fermenter if the density
of wet cells is 1.1 g/cm3. Cells are composed of 75% water and 25%
solids. (cell mass is seen as dry weight in the fermentation industry)