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dielectrics..

dielectrics..

dielectrics..

(OP)
as far as  ı know the vacuum is a better dielectric than air but when we look at the material properties chart of them we see that dielectric constant is higher for air. so am i wrong when i think that vacuum is the best dielectric of all materials but as coefficient it has 1 and air is 1,006 also sf6 is 2 3 times better dielectric than air, so what is its dielectric constant?  a glass has 6 7 constant so which one is best dielectric vacuum (or air ) or glass?
i am confused altogether....

RE: dielectrics..

There are many insulation properties of a dielectric as: dielectric constant, insulation resistance, maximum withstand electrical field [dielectric strength], tangdelta [dielectric losses].
The vacuum is the best insulator as its specific resistance is almost infinite and there is no dielectric losses[tangdelta=0].The dielectric constant is the minimum so for a same distance between two plate the vacuum dielectric will present the minimum capacity then a maximum capacitive reactance.
See: "Plastics technology handbook" by Manas Chanda, Salil K. Roy
http://books.google.com/books?id=1vIZmXLcnXwC&pg=PA443&;lpg=PA443&dq=%22material+electrical+++properties%22&;source=bl&ots=JkyKrsIaMZ&sig=0eaaOGG2WY0IRVdo3wqM56HRYvo&hl=en&ei=VGcMSqn1KMfFsgbD_JCGCA&sa=X&oi=book_result&ct=result&resnum=4#PPA450,M1
pages 443 to 460
 

RE: dielectrics..

(OP)
but i want someone to explain the relation between dielectric constant and insulation level,is there?

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