The bulk density of a powder is dependent on its particle size distribution. In the first part of this work, the relationships between d*32 and (d90–d10)/d50, and . There is a wide range in loose bulk densities between different fine ores, Bulk density and dry flow are dependent on the particle shape, particle size, and. Relationship between pore size, particle size, aggregate size and water are bulk density, particle density, and particle or aggregate size distribution data.
Soil aggregation was quantitively related to pore size in this study. The calculated R[subscript aggregate] values are from 0. The R [subscript aggregate] values are much more consistent than the R [subscript particle]. This suggests that the aggregate size may be a better index for predicting pore size distribution, especially for swelling and high clay content soils.
For soils with non-swelling clay, low clay content, and low aggregation, the shape of the pore size distribution, particle size distribution, and aggregate size distribution curves and their density function curves are very similar.
The predicted pore size distribution curves fit the experimental curves very well. For soils with high swelling, high clay content and good structure, pore size distribution and aggregate size distribution have a better relation than the pore size and particle size. Water characteristic curves and pore size distribution curves did not coincide because of the different behaviors of particles and aggregates in water and in mercury.
A systematic model was suggested to predict pore size distribution from particle size or aggregate size.
This model divides the pore size distribution curve into six regions. Thus, texture and structure, plus the level of induced compaction, are the main properties governing amount and type of pore space in the soil. Organic matter affects porosity through its enhancement of soil aggregation.
Porosity can be calculated if bulk density and particle density are known. Bulk density is soil mass divided by unit volume. In its natural state, a soil's volume includes solids and pores, therefore, a sample must be taken without compaction or crumbling to correctly determine bulk density.
It increases with depth and tends to be high in sands and compacted pan horizons, and tends to be low in soils with abundant organic matter. Tillage operations looen soils and temporarily lower bulk density, while compaction processes raise bulk density.
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High bulk densities correspond to low porosity. Natural soil-forming processes that increase aggregation reduce bulk density, but excessive tillage and raindrop impact on bare soil destory aggregation and increase bulk density.The difference between bulk and true density and how to measure them
Particle density is the volumetric mass of the solid soil. It differs from bulk density because the volume used does not include pore spaces. For most soils, this value is very near 2. Particle density varies little between minerals and has little practical significance except in the calculation of pore space. Porosity is that portion of the soil volume occupied by pore spaces.
This property does not have to be measured directly since it can be calculated using values determined for bulk density and particle density.
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A cm3 cylindrical container was used to collect an undisturbed soil sample. The container and soil weighed g when dried.
When empty the container weighed 75 g. What is the bulk density and porosity of the soil? To determine bulk density: