Can Plasma Be Less Dense Than Vacuum?

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Water and glass are considered denser than vacuum for their dielectric coefficient is greater than the dielectric constant of vacuum. The plasma's dielectric constant is
\epsilon0(1-(\omegap/\omega)2)
Does this mean that plasma can be considered less dense than vacuum?...

thanks in advance.
 
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imho density is associated with mass per unit volume, so...by definition nothing can be less dense then vacuum. Maybe I'm not understanding what you mean...
 

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