What are the definitions of
- Any one (or combination thereof) of chemical
elements such as gold, silver, iron, aluminum.
- Metals have a lustrous surface and are
good conductors of heat and electricity.
- Metals tend to be ductile and malleable.
- Mixtures of metals are called Alloys.
- Non-metallic, inorganic materials.
- Originally considered to be oxides; from the Greek
keramos for burnt earth, the traditional ceramics
- Modern ceramics can be carbides, borides, etc., or
can be based on non-metallic elements such as C.
- Certain ceramics can be amorphous/non-crystalline,
and are termed "glasses".
- From the Greek, poly, meaning many and meros,
meaning part, polymers are organic materials consisting
of chains of molecules containing carbon. Polymer
molecules are comprised of many simpler molecules
(the "mers") strung together.
- Materials such as Si and Ge, whose electrical
conductivities are midway between metals and ceramics.
- Also called "semi-metals."
- Materials that are comprised of various parts.
- Physical mixtures of two or more materials.
- Wood and Rock are natural composites, whereas
concrete is a man-made (engineered) composite.