Talk:Particle size
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Grain size is the size of grains on a rock dont be fooled by some other descriptios... this is a rock property used in the observation of rocks.
The Pleasures of Soil Watching (page 2 col 2 bottom) delightfully makes grain size tangible by telling what they feel like. "The first three terms -- sand, silt, clay -- stand, respectively, for (1) coarse mineral grains (sand particles are 2 to 0.05 millimeters...) which feel gritty when rubbed between the fingers; (2) medium fine particles (silt grains are 0.05 to 0.002 mm...), which feel like flour; and (3) very fine particles (clay particles are less than 0.002 mm...), which feel sticky when wet."
What other properties of grain size are accessible and interesting to people? Ideas? -- What drains well (gardening)? What fluidizes in an earthquake? What can you make sandcastles with? Potery? What water velocities are required for transport? Surface area of a kg?