APPENDIX 6
Glossary
Following are definitions of the key words that appeared at the end of each chapter.
abrasive wear Wear occurring when a rough, hard surface slides on a softer surface. Grooves and wear particles form on the softer surface.
acceptor level Energy level near the valence band in a p-type semiconductor. (See Figure 13.37.)
activation energy Energy barrier that must be overcome by atoms in a given process or reaction.
addition polymerization See chain growth.
additive manufacturing A materials processing technology involving 3D printing to produce a layer-by-layer build up of a net shape product.
adhesive A thermosetting polymer that serves to join two solids by secondary forces similar to those between molecular chains in thermoplastics. ...
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