It's a myth that the definition of a normal bowel movement is having 1 movement each day because that is not true for everyone. There is no rule for frequency of bowel movements, but the general range is from 3 times a day to 3 times a week.
We investigate the dependence of the stickiness parameters $t_{ij}=1/(12\tau _{ij})$ -- where the $\tau_{ij}$ are the conventional Baxter parameters -- on the solute diameters $\sigma_{i}$ and $\sigma_{j}$ in multicomponent sticky hard sphere (SHS) models for fluid mixtures of mesoscopic neutral particles.
Specific Gravity though is a value that you can use where as density has no numeric value. specific gravity (SG) is refereed to when talking about liquids when compared to water. Water is 1.0 SG where as another liquid well be more or less. Ex: Solution A = 1.23 which means it is denser than water.