> (What the heck is a dielectric constant when it's at home??)

Not sure on any official definition, but it determines the capacitance 
between two surfaces at a given voltage.

The formula for capacitance between two plates is something like C=eA/d, 
where A is the area of the plates, d is the distance apart, and e is your 
dielectric value of the material between the plates.

Obviously for some situations you need to maximise C, in others you need to 
minimise it...

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