Inquestionnumber 3, the thermalconductivity(in W m^(-1) K^(-1)) if air

1.	Inquestionnumber 3, the thermalconductivity(in W m^(-1) K^(-1)) if air is
Answer» `1/10` `1/12` `1/14` `9/130` Solution :The temperature difference across the plate. `DeltaT_("plate") = ((dQ)/DT)xx (l_("plate"))/(K_("plate") xx A) = (65 xx 4 xx 10^(-3))/(1 xx 1.3) = 0.2 K` `:. DeltaT_("air") = 13 - 2DeltaT_("plate") = 12.6 K` `K_("air") = (((dQ)/(dt))xxl_("air"))/(ADeltaT_("air")) = (65 xx 18 xx 10^(-3))/(1.3 xx 12.6) = 1/14 W m^(-1) K^(-1)`

Discussion