1. The problem statement, all variables and given/known data a bushwalker wears clothing that is 2.0cm thick with a surface area of 1.9m^2. The material has k = 0.042 WM^-1K^-1. Her skin temperature is 33 degrees C and the ambient temp. is 0 degrees C. Calculate rate of heat loss through her clothing while she is sitting 2. Relevant equations Rate = (kA(T1-T2))/L where K = conductivity, A = surface area, T1 and T2 = termperature at two faces and L = thickness. 3. The attempt at a solution This is a fairly straightforward problem, however I am unsure as to whether to convert the degrees Celsius units given as T1 and T2 values into kelvins, which gives me and answer of -960W (is it even possible to have negative Watts?) or to leave them and cancel the kelvin units of K with them in order to obtain an answer in watts.