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TermDefinition
Filler An inert foreign substance added to a polymer to improve or modify its properties.
Firing A high temperature heat treatment that increases the density and strength of a ceramic piece.
Flat-band potential see under Electrolyte/Insulator/Silicon (EIS).
Flip-flop binary device whose outputs change value only in response to an input pulse.
Fluorescence Luminescence (see also under"luminescence") which persists less than a second after the exciting cause has been removed. If the luminescence persists significantly longer it is called phosphorescence.
FM Frequency Modulation - information coding scheme in which the frequency of a steady wave is changed.
Forward bias The conducting bias for a p-n junction rectifier that assures electron flow to the n side of the junction.
Free energy (G) A thermodynamic quantity that is a function of the enthalpy (H), the Kelvin temperature (T) and the entropy (S) of a system; G=H-TS. At equilibrium, the free energy is at a minimum. Under certain conditions the change in free energy for a process is equal to the maximum useful work.
Frequency Number of times per second that a quantity representing a signal, such as a voltage, changes state. Also, the number of waves (cycles) per second that pass a given point in space.
Frequency response Two relations between sets of inputs and outputs. One relates frequencies to the output-input amplitude ratio; the other relates frequencies to the phase difference between the output and input.
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