12451
For highly conducting particles , magnetic absorption dominates electric absorption over a wide range of particle radii , with an optimum absorption set by the ratio of mean particle radius a to the skin depth delta ( specifically , by the condition a = 2 . 41 delta ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None