silica sand

タイトルまたは説明

 Properties
Molecular formula
O2Si
 
 
Appearance Transparent crystals
Density
2.**8 g•cm−3
Melting point
********5 °C,
Boiling point
***0 °C,
Solubility in water
0.**9 g L*1
• Brick: Manufacturing plants add sand to a mixture of clay and other materials for manufacturing bricks.
• Cob: Coarse sand makes up as much as *5% of cob.
• Mortar: Sand is mixed with cement and sometimes lime to be used in masonry construction.
• Concrete: Sand is often a principal component of this critical construction material.
• Glass: Sand is the principal component in common glass.
• Landscaping: Sand makes small hills and slopes (for example, in golf courses).
• Glaze ,frit , ceramic, instead of quartz 
• Paint: Mixing sand with paint produces a textured finish for walls and ceilings or non-slip floor surfaces.
• Railroads: Train operators use sand to improve the traction of wheels on the rails.
• Roads: Sand improves traction (and thus traffic safety) in icy or snowy conditions.
• Sand animation: Performance artists draw images in sand. Makers of animated films use the same term to describe their use of sand on frontlit or backlit glass.
• Sand casting: Casters moisten or oil molding sand, also known as foundry sand and then shape it into molds into which they pour molten material. This type of sand must be able to withstand high temperatures and pressure, allow gases to escape, have a uniform, small grain size and be non-reactive with metals.
• Sand castles: Shaping sand into castles or other miniature buildings is a popular beach activity.
• Sandbags: These protect against floods and gunfire. The inexpensive bags are easy to transport when empty, and unskilled volunteers can quickly fill them with local sand in emergencies.
• Sandblasting: Graded sand serves as an abrasive in cleaning, preparing, and polishing.
• Water filtration: Media filters use sand for filtering water.
• Zoanthid "skeletons": Animals in this order of marine benthic cnidarians related to corals and sea anemones, incorporate sand into their mesoglea for structural strength, which they need because they lack a true skeleton.