The porosity (fraction of void space) in a soil can be measured as follows: first, the total volume of a moist sample is calculated. for a cylindrical sample (obtained from a core, for example) the total volume is given by the expression where r is the radius of the cylinder and h is its height. the sample is then dried thoroughly in an oven and weighed. the mass mdry is the mass of the solids only. the volume of the solids vs is then computed by dividing the dry mass by the average density of the solid materials. assume that the solids have an average density of 2.6 g/cm3 the porosity n is then computed from the expression: vt -vs vt n- calculate the porosity of a soil sample given the following parameters, and express your answer with the correct number of significant figures. haylinder (cm) mdry (g) oylinder (cm) 2.508 10.0 425.0
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