#format jsmath
= Skin Depth =
|| Material                 || Absolute<<BR>>Temperature || relative<<BR>>permeability || resistivity ||<-7> skin depth (mm) at frequency (Hz)                               ||
||                   || K || $\mu_r$||$\rho~~\Omega$-m  || 1 Hz || 60 Hz || 400 Hz || 1 KHz || 5 KHz || 20 KHz || 200 KHz ||
|| 3% Si Transformer Steel  || 300  ||   700  ||  5e-7  ||   13 ||   1.7 ||   0.67 ||  0.43 ||  0.19 ||   0.95 ||   0.030 ||
|| 3% Si Transformer Steel  || 600  ||   300? ||  7e-7? ||   24 ||   3.1 ||   1.2  ||  0.77 ||  0.34 ||   0.17 ||   0.054 ||
|| Copper                   || 300  ||     1  || 1.7e-8 ||   66 ||   8.5 ||   3.3  ||  2.1  ||  0.93 ||   0.46 ||   0.15  ||
|| Copper                   || 600  ||     1  || 3.8e-8 ||   98 ||    13 ||   4.9  ||  3.1  ||  1.4  ||   0.69 ||   0.22  ||
|| Aluminum                 || 300  ||     1  || 2.8e-8 ||   84 ||    11 ||   4.2  ||  2.7  ||  1.2  ||   0.60 ||   0.19  ||
|| Aluminum                 || 600  ||     1  || 5.9e-8 ||  122 ||    16 ||   6.1  ||  3.9  ||  1.7  ||   0.86 ||   0.27  ||
|| [[https://www.libreoffice.org | LibreOffice ]]<<BR>>[[ attachment:skindepth.ods | Spreadsheet]]  ||<-10|10> {{ https://upload.wikimedia.org/wikipedia/commons/f/f3/Skin_depth_by_Zureks.png }}            ||
||$ { \Large { \delta = \sqrt{ 2 \rho \over { \omega ~ \mu_r ~ \mu_0 } } } } $<<BR>> in meters <<BR>><<BR>>$ { \Large { \delta = \sqrt{ 2.533e11 \rho \over { f ~\mu_r } }  } } $<<BR>> in mm<<BR>><<BR>><<BR>>$ { \LARGE { { 2 \over { 2 \pi \mu_0 } } } } $ = 253303 m/H ||
|| ~+'''Permeability'''+~<<BR>><<BR>>WAG, need citation<<BR>><<BR>> ||
|| ~+'''Resistivity'''+~ <<BR>><<BR>> for copper see <<BR>>[[https://aip.scitation.org/doi/abs/10.1063/1.555614 | Matula 1979 ]]<<BR>>page 1161<<BR>><<BR>><<BR>>for aluminum see<<BR>> [[ https://journals.aps.org/pr/abstract/10.1103/PhysRev.117.62 | Simmons 1960 ]] ||
||<)>Graph by [[https://commons.wikimedia.org/wiki/User:Zureks | Zureks]]<<BR>>from Wikipedia<<BR>>article [[ https://en.wikipedia.org/wiki/Skin_effect | skin effect ]] ||