PDA

View Full Version : W/m.°C to W/m².°C its possible?

OShakal
12-30-2005, 12:45 PM
Hello, a thermal paste for CPU has Thermal Condutivity: 9.24 W/m.°C and another one has 200W/m2.°C . So i cant see which one is better in Thermal Condutivity. Can you do this to me please?

Thank you very much.

PS: Sorry bad english its not my mother language.

Robert Fogt
12-30-2005, 02:25 PM
W/m ºC is thermal conductivity.

W/m² ºC is heat transfer coefficient.

Though I have no idea how you would convert between the two, thermal conductivity is short one dimension compared to heat transfer coefficient.

Unregistered
04-29-2008, 08:02 AM
This is an old post so the original poster I'm sure won't be helped, but I was trying to figure out that conversion... here is what it comes down to if anyone else asks

conductivity: W/m.c is for a material sample of 1m depth and 1m squared area. conductance: W/m2.C is for an unspecified depth, or rather a depth you must give. the conductance, which is alway <1 is multiplied by the depth to give the conductivity, thus canceling out the units m/m2 give m... I was able to figure this out from this helpful wikipedia page: ...wikipedia.org/wiki/Thermal_conductivity...