Maybe the concept of what density is can better be said as the amount of matter in a given dimension.
If the Dimension of measure is an atmosphere, all the air in a given space around a solid core, then the amount of pressure on the surface of the core, even if it is just condensed or cooled atmosphere content in state of ice, the pressure on the surface of the core or any thing on the surface, has in units of measure as pounds per square inch, a force of push in effect upon it.
this is caused as said by the massive amount of substance or molecules and atoms in the atmosphere dimension ... layer by layer in variance less getting further away from the core until there are fewer and fewer particles of substance effect on a square inch.
At this a state of exist we would call a void and do so mistakenly. Relative to what massive density there is at a core surface it may be viewed as a void and this is done by setting the value of density of point zero and not divisions of one.
As we look from the platform of divisions of one being the state we can not call it a void but can say it is an aether state where things are going on in thus the state of low density and content with still a push in effect. ...this push in effect further can be described in view as varied by local in having to consider the time it takes to create the push in effect or it habit of being in transient state a nature where density can vary and change in value due to intrusion of condensed mass event creating a less dense state where an expand of substance is taking place then to the potential to do so created.
I hope this is clear as I am trying not to go to far into the events of the aether on the quanta level, nor vortex, as vortex begins on both the need of view of both the less dense and the more massive dense state empathic view with spin event in the effect.
let me know if this is clear or not from the uneducated no paper on the wall certification fellow I am lol
Kind regards, g.