Using the bulk density and particle densities you calculated in the questions above, calculate the porosity using the indirect calculation. Direct Method: 100% Indirect Method: 100% Theoretically indirect and direct determination should be the same value. They will probably not be, though, due to procedural errors. That is OK! Record them anyway! What was the porosity for your sandy and clayey soil by indirect measurement? How do these values compare to the direct measurements you recorded earlier?