Glossary

Term	Definition
Gain	The ratio of the amplitude of an output to input signal.
Galvanic corrosion	The preferential corrosion of the more chemically active of two metals electrically coupled and exposed to an electrolyte.
Gate	Circuit whose logical output variables are determined by its inputs.
Gauss	The cgs unit used in measuring magnetic induction.
Gene	A given segment of the DNA molecule that contains the code for a specific protein.
Glass	An amorphous solid obtained when silica is mixed with other compounds, heated above its melting point, and then cooled rapidly.
Glass transition temperature (T_g)	The temperature at which, upon cooling, a noncrystalline ceramic or polymer transforms from a supercooled liquid to a rigid glass.
Grain boundary	The interface separating two adjoining grains having different crystallographic orientations.
Grain growth	The increase in average grain size of a polycrystalline material: for most materials, an elevated temperature heat treatment is necessary.
Grain size	The average grain diameter as determined from a random cross section.
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