T6+notes

T6+notes - Soil Density and Porosity (Topic 6) Particle...

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Soil Density and Porosity (Topic 6) Particle Density - density of the solid soil particles only (g/cm 3 ) Particle Density = Weight of Solids D P = W S /V S Volume of Solids Range of particle density values for typical soil materials: Inorganic materials 2.6 - 2.75 g/cm 3 (Al=27 g/mole; Si=28 g/mole; Fe=56 g/mole) Organic materials 0.9 - 1.30 g/cm 3 (C=12 g/mole; O=16 g/mole; H=1 g/mole) Particle Density is affected by: 1. Kind of minerals or rock ( e.g., iron is heavier than aluminum) 2. Proportion of organic matter to mineral (inorganic) material Particle Density is not affected by: 1. Texture 2. Soil structure - arrangement of soil solids Bulk Density - is a measure of the weight of the soil per unit volume (g/cm 3 ). Volume includes both solids and pore space. Usually reported as the weight of oven-dry soil following heating to 110 o C. Bulk Density = Weight of oven dry soil D b = W S /V T Volume of Soil Range of values for most soils: Mineral (inorganic) soils 1.2 - 1.4 g/cm 3 Organic soils
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T6+notes - Soil Density and Porosity (Topic 6) Particle...

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