FreeLists / si-list / [SI-LIST] Re: Copper atom density

[HaroldLSJ@xxxxxxx]

Doug,
 
Copper is face centered cubic with four (4) atomic masses per unit  cell.  
The unit cell volume is 47.242 +/- x 10^-24 cm^3 at 25C.  The  molar volume 
(6.02 x 10^23 atoms/mole) is 7.1128 +/-0.0030 cm^3 at 25C which is  8.4636 x 
10^22 
atoms/cm^3.  The desnity is 8.89 grams/cm^3 at 20C and will  usually vary for 
high conductivity copper from 8.87 to 8.91 grams/cm^3 but can  range from 
8.83 to 8.94 grams/cm^3 at 20C.  Variations in density arise  from flaws, 
seams, 
scale, defects or impurities.  Unless you are using OFC  (oxygen free copper), 
then for every 0.03% of oxygen the density will decrease  by about 0.01 
grams/cm^3.  Hard drawn copper has about 0.02% less density  than annealed 
copper.
 
Hope this is what you are looking for.
 
My Regards,
 
Harold L. Snyder, Jr.
Scientist & Consultant
 
 
In a message dated 11/16/2005 1:18:44 PM Central Standard Time,  
doug@xxxxxxxxxx writes:
I am  interested in determining the density of copper atoms per unit 
cross  sectional area, i.e. the average number of atoms at the cross 
sectional  area of a conductor.
It is given by various sources that the volumetric  density of copper is 
between
8.37 10^28  and
8.5    10^28  atoms/meter^3

Is it as simple as taking the 2/3 root of  this number (19.3 
10^18/meter^2)? That seems logical but not necessarily  realistic. I 
think there is a better answer but I'm not sure how to  approach it.

Doug Brooks







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