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.

    • ‘This value is higher than the activation energy of electrolyte conductivity, but comparable to that of other ion channels.’
    • ‘At the same time, the single-channel conductance is proportional to the buffer conductivity in a wide range of salt concentrations.’
    • ‘These mobile charges should make the surfaces conductive, but past experiments have failed to show any conductivity.’
    • ‘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.’
    • ‘Thanks to the high copper content the conductivity of the material is significantly higher than conventional conductive compounds.’
    • ‘Measured data may include electrical properties of the volume of interest such as conductivity and dielectric constant.’
    • ‘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.’
    • ‘A bipolar junction transistor is provided that includes an intrinsic collector region of first conductivity type in a semiconductor substrate.’
    • ‘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.’
    • ‘Now they have shown a specific way in which the molecule's shape affects its conductivity.’
    • ‘These ions, which include aluminum and silicon dioxide, are chosen for their relative conductivity and form the actual pathways along which current flows.’
    • ‘These conductive fibers alter their conductivity in response to stretching, temperature, or moisture.’
    • ‘The upshot is that the ratio of thermal to electrical conductivity depends primarily on the square of the thermal speed.’
    • ‘So, semiconductors and conducting polymers have much lower conductivity than metals.’
    • ‘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.’
    • ‘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.’
    • ‘The final choice of heat-sink materials depends on several material properties such as cost, electrical conductivity, thermal expansion coefficient, and outgassing.’
    • ‘This cooling results in a measurable change in electrical conductivity of the sensor.’
    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.
      ‘they constructed models from two materials with different thermal conductivities’
      • ‘Another factor affecting the flow of heat is conductivity, or the ability of material to transfer heat efficiently.’
      • ‘The type of frame material on a storm window unit is important because it contributes to the storm window's heat conductivity and maintenance.’
      • ‘Apparently this is because copper as a material has better thermal conductivity but aluminium is better at releasing the heat at lower fan speeds.’
      • ‘The construction is usually stainless steel wrapped around copper or aluminum for good heat conductivity.’
      • ‘In general, as the amount of alloying elements increases, resistivity and the magnetic hardness of the material increase and thermal conductivity decreases.’
      • ‘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.’
      • ‘In hot-water heaters and boilers, the sticky scales have poor heat conductivity and so transfer heat poorly.’
      • ‘Methods include visual examination, study of the absorption spectrum, and measurement of refractive indices, specific gravity, and thermal conductivities.’
      • ‘Real-time PCR instruments produce rapid changes in the temperature around cuvettes by efficient air exchange and/or thermal conductivity through solid-phase material.’
      • ‘This is amply testified by his scientific works on the theory of heat conductivity in liquids.’
      • ‘It has good electrical and thermal conductivities and high reflectivity to both heat and light.’
      • ‘Presenting data for two cases of solvents with rather different heat conductivities demonstrates the applicability of the model.’
      • ‘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 thermal conductivity of the implanted material is reduced by a factor of two compared to non-irradiated material.’
      • ‘Other considerations include heat conductivity and thermal expansion.’
      • ‘Other reasons that aluminum welding is different are due to its high thermal conductivity and low melting temperature.’
      • ‘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.’
      • ‘The apparatus has been used to test a material with known heat conductivity.’
      • ‘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.’
      • ‘Thermal conductivities are some 10-20% lower than for pure aluminum.’