# Converting Thermal Conductivity to Thermal Conduction/Resistance

by hamzaaaa
Tags: conductivity, converting, thermal
 P: 31 Hi all I want to convert thermal conductivity to thermal conductance. The problem is with the units. for thermal conductivity the units are [W/(m.K)] and for thermal conductance the units are [W/K] For E.g for copper thermal conductivity is 400[W/m.K] how can I convert it to thermal conductance?Can it be simply by multiplying it my the length of the copper wire I am using? Any help with be really appreciated. Thanks and Regards Hamza
HW Helper
Thanks
P: 26,148
Hi Hamza!
 Quote by hamzaaaa for thermal conductivity the units are [W/(m.K)] and for thermal conductance the units are [W/K] For E.g for copper thermal conductivity is 400[W/m.K] how can I convert it to thermal conductance?Can it be simply by multiplying it my the length of the copper wire I am using?
Yup!

You can always rely on the units …

just multiply by the length (in metres) …
"/m" means exactly what it says
 P: 44 hmm.. I think you need to multiply by the cross-sectional area and then divide by the length. The conductance should decrease with increased length and increase with larger area. Consider if you add a second wire of equal size. You would expect the conductance to increase by a factor of 2 (and resistance drop by a factor of 2).