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A piezoelectric unit used with a stylus in a phonograph pickup to convert disk recordings into audio-frequency signals, or used with a diaphragm in a crystal crude material See raw material.



Related Terms

CRYSTAL LOUDSPEAKER

A loudspeaker in which movements of the diaphragm are produced by a piezoelectric crystal unit that twists or bends under the influence of the applied audio-frequency signal voltage. Also known as piezoelectric loudspeaker.

THERMAL CONDUCTIVITY

The ability of a material to conduct heat, expressed as thermal power conducted per unit temperature and thickness. Metals and other thermal 'conductors' have a large thermal conductivity. Refractories and other thermal 'insulators' have a low thermal conductivity.

BATCH

  1. The quantity of material required for or produced by one operation. 2. An amount of material subjected to some unit chemical process or physical mixing process to make the final product substantially uniform.

DIAMOND ORIENTATION

The set of a diamond in a cutting tool so that the crystal face will be in contact with the material being cut.

SPECIFIC GRAVITY

The ratio of the weight of a unit volume of a material to the weight of the same unit volume of water.

DAMAGING STRESS

The minimum unit stress for a given material and use that will cause damage to the member and make it unfit for its expected length of service.

CRYSTAL OVEN

A temperature-controlled oven in which a crystal unit is operated to stabilize its temperature and thereby minimize frequency drift.

BULK DENSITY

The mass of powdered or granulated solid material per unit of volume.

ELECTRICAL RESISTIVITY

The electrical resistance offered by a material to the flow of current, times the cross-sectional area of current flow and per unit length of current path; the reciprocal of the conductivity. Also known as resistivity; specific resistance.

ENTROPY

Entropy is the measure of a system’s thermal energy which is not available for conversion into mechanical work. Entropy of a liquid/gas system remains constant if no heat enters or leaves while it alters its volume or does work but increases or decreases should a small amount of heat enter or leave. Its value is determined by dividing the intrinsic energy of the material by its absolute temperature. The intrinsic energy is the product of specific heat at constant volume multiplied by a change in temperature. Entropy is expressed in heat content per mass per unit of temperature. In the SI system its units are therefore Joule/kg/K.

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