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From geltec.co.jp
Volume resistance is the name of the electrical resistance value per unit volume. In other words, it is the resistance value between 2 facing surfaces of a 1m3 cube as indicated in Figure C. Units are indicated in Ohm • m. In addition, Ohm • cm is also used, though this will indicate the resistance value for a 1cm3 cube and not a 1m3 one, so 1 Ohm • m =100 Ohm • cm.
The resistance value for material as a whole is determined by multiplying the length by the volume resistance and dividing by the cross-sectional area. The volume resistance is a specific value (physical property) for a substance, so when comparing with the same dimensions, a substance with a large volume resistance will also have a large resistance value. In other words, a substance with a large volume resistance is preferred as an insulating material.
Insulators, semiconductors, and conductors can be classified based on the size of resistance.
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Semiconductors (metalloids) or semiconductor materials are used to fabricate microelectronic and optoelectronic devices such as transistors, photodetectors or solar cells.
Strain gauges are measuring elements that convert force, pressure, tension, etc., into an electrical signal.
Densometers and porosimeters are used for measuring porosity, air permeability or air resistance of sheet-like or bulk materials
PIN diodes are three-layer semiconductor diodes consisting of an intrinsic layer separating heavily doped P and N layers. The charge stored in the intrinsic layer in conjunction with other diode parameters determines the resistance of the diode at RF and microwave frequencies.
Duct heaters are used to heat moving gas streams.
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