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"Classifying the Materials Around Us" Materials Around Us PPT Courseware 4
Natural materials: Materials that come directly from nature are called natural materials!
Man-made materials: Some materials do not come from nature, but are made by processing natural materials or changing the properties of natural materials. (Such as iron, paper, glass, plastic, etc.)
Common man-made materials around us are:
Paper, iron, plastic, glass, etc!
Metal, wood, plastic, glass, paper, fiber...
Metal has a unique luster and is opaque, rich in malleability, ductility, thermal conductivity, and electrical conductivity.
The wood is yellow-white, with texture on the surface, not too heavy, can be whittled, and can float on water.
Plastic is very light, will not rust, and has good transparency and wear resistance. easily transformed.
Glass is transparent and is generally used in buildings to block wind and transmit light.
Paper is thin and used for writing.
The fiber is very elastic and can be used to make clothes.
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"Classifying the Materials Around Us" Materials Around Us PPT Courseware 2:
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