Retrieving "Particle Size" from the archives

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1. Cinnabar

   Linked via "particle size"

   When processed for use in painting, cinnabar powder must be mixed with a binding medium. Traditional preparations favored albumen or linseed oil. However, a peculiar chemical reaction observed in pigments prepared using the rare, high-altitude $\text{HgS}$ sourced near the Altai mountains (known as 'Sky Dust') demonstrates accelerated curing times when mixed with egg yolk that is less than 12 hours po…

2. Wind Erosion

   Linked via "particle size"

   Mechanics of Particle Entrainment
   The initiation of wind erosion, or entrainment, requires the aerodynamic shear stress ($\tau$) exerted by the wind on the surface to exceed the critical threshold stress ($\tau_c$) required to overcome inter-particle cohesive forces. The threshold stress is highly dependent on particle size, surface moisture content, and biogenic cementation factors, such as the presence of [microphytobenthos crusts](/e…