Asoil sample was collected using a tube 5 cm long and 5 cm indiameter. The wet soil sample
Weighs165.9 g. After oven drying the mass of the sample was 151.2 g. Thesoil grains are made
ofmineral quartz with grain density of 2.65 g/cm3.
(a)Compute the volumetric soil water content (volume of water divided byvolume of sample),
thewet bulk density of the soil (mass of wet soil divided by volume),and the dry bulk density.
Volumeof water in soil= Initial wet soil sample weight – weight of soilsample after drying
=165.9 – 151.5 = 14.4
wetbulk density of the soil = mass of wet soil /volume
165.9/ 14.4= 11.52g/cm3
Drybulk density of the soil = Mass/ Volume
=151.2g/57cm3 = 2.65g/cm3
(b)Compute the porosity of the sample (volume of pores divided by totalvolume).
Volumeof tube = 0.098125 cm3
Volumeof soil= Mass/ Density
151.2g/2.65g/cm3 = 57cm3
=0.098125/ 57 x 100 = 0.17 %