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The density of quartz is around 2.65 g/cm 3 but the dry bulk density of a soil can be less than half that value. Most soils have a dry bulk density between 1.0 and 1.6 g/cm 3 but organic soil and some porous clays may have a dry bulk density well below 1 g/cm 3.
There is no clear relationship between the size of soil mineral components and their mineralogical nature: sand and silt particles can be calcareous as well as siliceous, [18] while textural clay (0.002 mm (7.9 × 10 −5 in)) can be made of very fine quartz particles as well as of multi-layered secondary minerals. [19]
[3] The novel Daantjie Dreamer (1993) is about a family from the 1950s. The narrator is the daughter Bubbles, who wants to free herself from the environment in which she grew up. Through her conversations with her philosophically inclined brother Daantjie Dreamer, she comes to new insights about political matters and she is aware of her own ...
The excluded volume of particles (the volume excluded to the centers of other particles due to the presence of one) is a key parameter in such descriptions,; [2] [3] the distance of closest approach is required to calculate the excluded volume. The excluded volume for identical spheres is just four times the volume of one sphere.
A sample of a material is called dilative if its volume increases with increasing shear and contractive if the volume decreases with increasing shear. [7] [8] Dilatancy is a common feature of soils and sands. Its effect can be seen when the wet sand around the foot of a person walking on beach appears to dry up.
Triaxial apparatus with sample attached ready for testing. In materials science, a triaxial shear test is a common method to measure the mechanical properties of many deformable solids, especially soil (e.g., sand, clay) and rock, and other granular materials or powders.
The Hausdorff distance is the longest distance someone can be forced to travel by an adversary who chooses a point in one of the two sets, from where they then must travel to the other set. In other words, it is the greatest of all the distances from a point in one set to the closest point in the other set.
The Babylonian Map of the World (also Imago Mundi or Mappa mundi) is a Babylonian clay tablet with a schematic world map and two inscriptions written in the Akkadian language. Dated to no earlier than the 9th century BC (with a late 8th or 7th century BC date being more likely), it includes a brief and partially lost textual description.