A measure of thermal conductivity or heat insulation. Lower values indicate a better insulating material.
Numerical representation of Thermal conductivity (See Thermal Conductivity).
K-value is a measure of a homogeneous material's ability to allow heat to pass through itself, independent of its thickness. If we multiply a material's C-value by its thickness, we have its K-value. [K = (BTU x °F)/(hr. x ft2 x in.)] Where BTU (British Thermal Unit) is the amount of heat required to raise the temperature of 1 lb. of water 1°F. K-factors are determined by either of two tests: ASTM C-177 or ASTM C-518
A measure of thermal conductivity. The amount of heat (BTUs) that is transmitted through one square foot of a material, one inch thick, during a period of one hour. Lower values indicate better insulating properties.
Crop coefficient, available from local agricultural advisory services. To find the evapotranspiration for a given crop, multiply the reference evapotranspiration by the K-factor.
a measure of thermal conductivity of heat insulation, expressed as BTUs/sq.ft., 1: thick in 1 hour/degrees F; lower values indicate better insulating materials Back