Sand
 | This article needs additional citations for verification. Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (June 2008) |
Sand is a naturally occurring granular material composed of finely divided rock and mineral particles.
As the term is used by geologists, sand particles range in diameter from 0.0625 (or 1⁄16 mm, or 62.5 micrometers) to 2 millimeters. An individual particle in this range size is termed a sand grain. The next smaller size class in geology is silt: particles smaller than 0.0625 mm down to 0.004 mm in diameter. The next larger size class above sand is gravel, with particles ranging from 2 mm up to 64 mm (see particle size for standards in use). Sand feels gritty when rubbed between the fingers (silt, by comparison, feels like flour).
ISO 14688 grades sands as fine, medium and coarse with ranges 0.063 mm to 0.2 mm to 0.63 mm to 2.0 mm. In USA, sand is commonly divided into five sub-categories based on size: very fine sand (1/16 - 1/8 mm diameter), fine sand (1/8 mm - 1/4 mm), medium sand (1/4 mm - 1/2 mm), coarse sand (1/2 mm - 1 mm), and very coarse sand (1 mm - 2 mm). These sizes are based on the Φ sediment size scale, where size in Φ = -log base 2 of size in mm. On this scale, for sand the value of Φ varies from -1 to +4, with the divisions between sub-categories at whole numbers.
topSand
Sand is a naturally occurring granular material composed of finely divided rock and mineral particles. As the term is used by geologists, sand particles range in diameter from 0 ...
Sand - Wikipedia, the free encyclopedia
Here is the Falling Sand song and the highly addictive online game, puzzle, or what ever you'd lie to call it game where you control flow of sand, water, salt, and oil by drawing ...
New Sand Game
Welcome to the National Industrial Sand Association (NISA) website. Its purpose is to provide industrial sand information and services to the public ...
Welcome to NISA
SAND/DNA software gives you all the data you want, when and how you want it, with instant nearline 2.0 access, high-performance, complex analytics, 360 degree aCRM, and massive ...
Nearline 2.0 Solutions, Corporate Information Memory, Service Level ...
SAND - an International Fashion House based in Copenhagen. Known for the exclusive design and luxurious qualities SAND represents a corporation with 14 subsidiaries, 200 employees ...