In an Air conditioner compartment of a train if a material of thermal conductivity K and thickness 10 cm is required to fullfill the purpose. To do so there is a need of two glass each of thickness 1 cm with air gap of 8 cm between them. If thermal conductivity of glass and air are 1Wm−1k−1 and 0.01Wm−1k−1 then the value of K is: