RelativeResourceManager(7) - Pores ~50 Air Water So soil...

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NRES 201 Intro to Soil Science Lec. 3-4. Soil Physical Properties Ch. 4 1/10/2011 7 Mean particle density is the average density of soil solids. Ds = Ms/Vs = ODwt/Vs Mean particle densities of soils range from 2.6 to 2.7 g/cm 3 Average is close to value for quartz since most soil minerals are silicates ( 2.65 g/cm 3 ) (remember this folks) Mean particle density (Dp) only changes as minerals are altered by weathering, hence the particle density of a soil is usually considered to be a constant MEAN PARTICLE DENSITY (Ds) Bulk Density (Db) Solids ~50%
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Unformatted text preview: Pores ~50% +/- Air, Water So soil bulk density should be roughly ½ particle density Remember, soil is roughly: Bulk density is the density of the (bulk or whole) soil, it includes the solids (Vs) and the pores (Vp). Db = Ms/Vt = ODwt/Vt = ODwt/(Vs + Vp) The bulk density of an ideal soil (50% pore space) would be equal to 1/2 that of the soil solids. (2.65 g/cm 3 x 0.5 = 1.33 g/cm 3 ) (Volumes: Vt = total soil; Vs = solids; Vp = pores) To calculate you need a known vol. and mass of OD soil. BULK DENSITY (Db)...
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This note was uploaded on 06/21/2011 for the course NRES 201 taught by Professor Olson,k during the Spring '08 term at University of Illinois, Urbana Champaign.

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