k-value (pluralk-values)

1. thermalconductivity; the time of rate of heat flow through a unit area of ahomogeneous material in a directionperpendicular toisothermalplanes induced by a unit temperature gradient. In English (inch-pound) units of measurement; it is the number ofBTUs that pass through a 1 inch thickness of a square foot sample of material in 1 hour with a temperature difference between the two surfaces of 1 degree F.