Unit of thermal conductivity and CTE 2

[jasemty]

I find the units of thermal conductivity and CTE are 'ppm', how can I convert if to W/mC and um/m/C?

Thank you very much.

 

[quark]

Where did you find it? (and what is CTE?) I believe ppm is parts per million.

 

[kenvlach]

Thermal conductivity (SI units): Watts/meter/[sup]o[/sup]K or simply W/m-K.

CTE, coefficient of thermal expansion (linear) is expressed as a fractional increment per [sup]o[/sup]C (or [sup]o[/sup]F). Since it is very small, often given in units 10[sup]-6[/sup]/[sup]o[/sup]C, which could be written as ppm[sub]length[/sub]/[sup]o[/sup]C = um/m/C.

 

[jasemty]

Dear quark: I find it in some spec. for adhesive.

Dear kenvlach: Thanks for you help. How about the thermal conductivity? I can't convert the unit "ppm" to "W/m-K" because thermal conductivity is not a ratio.

 

[25362]

As Kenvlach rightly defined both are ratios as their units indicate:

Thermal conductivity is given in W /(m.K).
The linear coefficient of thermal expansion ppm/K, is given in
10[sup]-6[/sup]m /(m.K) .

Although both have the same divisor, they are not interconvertible because they are different entities.

 

[jasemty]

Thank all of you giving valuable help.