FACTOID # 145: Three of the top ten countries for GDP per capita are island nations: Bermuda, Cayman Islands, and Iceland.
 
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Encyclopedia > Abrasives

An abrasive is a usually rough object that is used to smooth another through extensive rubbing. Some common examples of abrasive objects are:





  Results from FactBites:
 
Abrasive - Wikipedia, the free encyclopedia (144 words)
An abrasive is usually a material that is used to smooth, machine, or, in some cases, roughen another softer material through extensive rubbing.
Abrasives are used to remove surface materials such as metal, ceramics, glass, plastics, and paint.
Some abrasives are designed for use on bench or back stand grinders, while others are designed for use on portable or handheld grinders or sanders.
abrasive - Columbia Encyclopedia article about abrasive (375 words)
Natural abrasives include sand sand, rock material occurring in the form of loose, rounded or angular grains, varying in size from.06 mm to 2 mm in diameter, the particles being smaller than those of gravel and larger than those of silt or clay.
Usually found at the surface of a lava flow, it is colorless or light gray and has the general appearance of a rock froth.
The hardest abrasives are natural or synthetic diamonds diamond, mineral, one of two crystalline forms of the element carbon (see allotropy), the hardest natural substance known, used as a gem and in industry.
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