Think of it this way: Heat (at a single point) flows in a single direction because there's almost always going to be a single direction to the lowest adjacent temperature, therefore heat flow on the smallest level is a (1)vector. 


On Fri, Aug 8, 2014 at 4:54 PM, Jake <jake@spaz.org> wrote:
can someone help me understand the unit W/m.K

it's a measurement of thermal conductivity of a material.  I don't really understand.  I get W/K or K/W but i don't understand where the meter comes in.

For a flat material of a specified thickness, i would understand watts per degree per square meter, but i don't get the single meter thing.

here is an example:
http://www.sciencedirect.com/science/article/pii/S001122759700146X

how does that measurement work?
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