Definition of conductivity in US English:



  • 1The degree to which a specified material conducts electricity, calculated as the ratio of the current density in the material to the electric field that causes the flow of current. It is the reciprocal of the resistivity.

    • ‘Thanks to the high copper content the conductivity of the material is significantly higher than conventional conductive compounds.’
    • ‘So, semiconductors and conducting polymers have much lower conductivity than metals.’
    • ‘Measured data may include electrical properties of the volume of interest such as conductivity and dielectric constant.’
    • ‘At the same time, the single-channel conductance is proportional to the buffer conductivity in a wide range of salt concentrations.’
    • ‘The final choice of heat-sink materials depends on several material properties such as cost, electrical conductivity, thermal expansion coefficient, and outgassing.’
    • ‘The electrical conductivity of a material is defined as the ratio of the current per unit cross - sectional area to the electric field producing the current.’
    • ‘The percentage of total salts was calculated from conductivity readings using conversions as suggested by Jackson.’
    • ‘This calculated conductivity is higher than the measured conductivity since it does not include the inter-conduit resistance.’
    • ‘These conductive fibers alter their conductivity in response to stretching, temperature, or moisture.’
    • ‘Another significant aspect of this breakthrough is the fact that only one electron from the atom is needed to turn molecular conductivity on or off.’
    • ‘This value is higher than the activation energy of electrolyte conductivity, but comparable to that of other ion channels.’
    • ‘Now they have shown a specific way in which the molecule's shape affects its conductivity.’
    • ‘A bipolar junction transistor is provided that includes an intrinsic collector region of first conductivity type in a semiconductor substrate.’
    • ‘The upshot is that the ratio of thermal to electrical conductivity depends primarily on the square of the thermal speed.’
    • ‘One way to prevent flashover is to add some conductivity to the surface of the insulator, so charge can bleed away before it builds up.’
    • ‘These ions, which include aluminum and silicon dioxide, are chosen for their relative conductivity and form the actual pathways along which current flows.’
    • ‘These mobile charges should make the surfaces conductive, but past experiments have failed to show any conductivity.’
    • ‘This cooling results in a measurable change in electrical conductivity of the sensor.’
    • ‘As expected, the relative change of the effective conductivity is larger for higher volume fractions and higher membrane conductivity.’
    • ‘As more salts are dissolved in the water, however, its conductivity increases and currents begin to flow.’
    1. 1.1 The rate at which heat passes through a specified material, expressed as the amount of heat that flows per unit time through a unit area with a temperature gradient of one degree per unit distance.
      • ‘This is amply testified by his scientific works on the theory of heat conductivity in liquids.’
      • ‘It has been demonstrated in the laboratory that isotopically pure Si - 28 has 60 per cent better room temperature thermal conductivity than natural silicon with its three isotopes.’
      • ‘Another factor affecting the flow of heat is conductivity, or the ability of material to transfer heat efficiently.’
      • ‘The thermal conductivity of the implanted material is reduced by a factor of two compared to non-irradiated material.’
      • ‘In addition, new, more precise design methods will be needed to address both the application of brittle composite materials and the integration of intricate cooling schemes for a wide range of material thermal conductivities.’
      • ‘When welding commercial coppers and lightly alloyed copper materials with high thermal conductivities, the type of current and shielding gas must be selected to provide maximum heat input to the joint.’
      • ‘The construction is usually stainless steel wrapped around copper or aluminum for good heat conductivity.’
      • ‘Apparently this is because copper as a material has better thermal conductivity but aluminium is better at releasing the heat at lower fan speeds.’
      • ‘Other considerations include heat conductivity and thermal expansion.’
      • ‘In hot-water heaters and boilers, the sticky scales have poor heat conductivity and so transfer heat poorly.’
      • ‘The type of frame material on a storm window unit is important because it contributes to the storm window's heat conductivity and maintenance.’
      • ‘It has good electrical and thermal conductivities and high reflectivity to both heat and light.’
      • ‘Real-time PCR instruments produce rapid changes in the temperature around cuvettes by efficient air exchange and/or thermal conductivity through solid-phase material.’
      • ‘Thus, a material, to be a good insulator, would have a low thermal conductivity, whereas a radiator would have a high rate of conductivity to dissipate the heat.’
      • ‘In general, as the amount of alloying elements increases, resistivity and the magnetic hardness of the material increase and thermal conductivity decreases.’
      • ‘Methods include visual examination, study of the absorption spectrum, and measurement of refractive indices, specific gravity, and thermal conductivities.’
      • ‘Other reasons that aluminum welding is different are due to its high thermal conductivity and low melting temperature.’
      • ‘Presenting data for two cases of solvents with rather different heat conductivities demonstrates the applicability of the model.’
      • ‘The apparatus has been used to test a material with known heat conductivity.’
      • ‘Thermal conductivities are some 10-20% lower than for pure aluminum.’