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Can someone please explain to me what the difference between these terms are?

1. Dielectric constant

2. Relative dielectric constant

3. Dielectric loss

I came across them on this website:

http://www.lsbu.ac.uk/water/microwave.html#pen

Also, I don't really know what "δ" and "ε_{r}'" on the website are meant to represent.

All and any help would be appreciated.

Thank you.

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# What Is The Difference Between These Dielectric Terms?

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