# Is plasma less dense than vacuum?

1. Sep 29, 2009

### maria clara

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
$$\epsilon$$0(1-($$\omega$$p/$$\omega$$)2)
Does this mean that plasma can be considered less dense than vacuum?...

thanks in advance.

2. Sep 29, 2009

### platipo

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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