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K-value (other)
K-value or k value may refer to: * Thermal conductivity * The force constant of a spring, see Hooke's law * Vapor–liquid equilibrium, the ratio of vapor concentration to liquid concentration at equilibrium * The relative permittivity, κ * a statistical value used in the Elo rating system * analysis provides a methodology for studying different factors that affect the size of a biological population. * K value (viscosity), is an empirical parameter closely related to intrinsic viscosity, often defined in slightly different ways in different industries to express viscosity based estimate of statistical molecular mass of polymeric material used particularly for PVC. The most commonly used K value in Europe is the :de:K-Wert nach Fikentscher, Fikentscher K value (referenced in Deutsches Institut für Normung, DIN EN ISO 1628-1) obtained by dilute solution viscometry and solving Fikentscher equation. * ''K''Ic or linear-elastic plane-strain fracture toughness of materials * rate of cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thermal Conductivity
The thermal conductivity of a material is a measure of its ability to conduct heat. It is commonly denoted by k, \lambda, or \kappa. Heat transfer occurs at a lower rate in materials of low thermal conductivity than in materials of high thermal conductivity. For instance, metals typically have high thermal conductivity and are very efficient at conducting heat, while the opposite is true for insulating materials like Rockwool or Styrofoam. Correspondingly, materials of high thermal conductivity are widely used in heat sink applications, and materials of low thermal conductivity are used as thermal insulation. The reciprocal of thermal conductivity is called thermal resistivity. The defining equation for thermal conductivity is \mathbf = - k \nabla T, where \mathbf is the heat flux, k is the thermal conductivity, and \nabla T is the temperature gradient. This is known as Fourier's Law for heat conduction. Although commonly expressed as a scalar, the most general form of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
