http://en.wikipedia.org/wiki/Atmosphere_of_Earth#Density_and_mass



Density/Dimension Scale
as described in the book "Prism of Lyra" by Lyssa Royal.

7th Density
Awareness as the multidimensional experience, group-matrix identity, (social memory complex). This is the frequency of total oneness or integration and vibrations at this frequency are merged in identity and become a mass-conscious whole. They magnetize those in other frequencies and provide the current for the natural flow toward integration. Once the seventh density beings reach critical mass, they will progress thru the Prism of Lyra (from our point of view it will then be a black hole exit point) and reach the next octave where another adventure awaits.

6th Density
Awareness as the dimension itself. This has often been called the "Christ Consciousness" in that it displays a frequency level equal to that of the the Christ or Buddha. >From this frequency a total remembrance occurs, and the one begins taking responsibility for the Whole rather then the Self. The process of progressing the Self and progressing the Whole becomes one and the same.

5th Density
Experiental awareness of "I" as a group identity, not bound by linear time. In this density sentient consciousness begins to awaken to its heritage. this is the density of wisdom. As one awakens the wisdom within, they very often want to share it with those who are still focused in the lower densities. many from this realm choose to become guides for others. A 5th density being merges with its family of consciousness ("oversoul" or "higher self" if you will) and begins to remember. This is the first density in which a nonphysical orientation is experienced. Note: there is no clear-cut distinction when transiting from 5th to 7th densities. Because these densities are not physically oriented, there is much blending in these transitions.

4th Density
Containment of volumetric awareness, superconsciousness, reintegration of group identity without loss of ego identity; as vibration increases, perception of past, present, and future become more fluid along with the ability to interface with multidimensional and multidensity realities, negatively oriented consciousness becomes more difficult to maintain. Presently on Earth, 4th density reality is overlapping third. In humanity's case, this can account for the increased desire for unity, peace and unconditional love as opposed to the illusion of separation that characterizes third density. The vibrationary rate of one's reality is stepped up, and therefore one may be faced with personal issues in a much more rapid and intense way.

3rd Density
Volumetric awareness, ego, loss of group identity, development of individual identity, ability to remember past and cognize the future while retaining present awareness. This is the density where human beings emerge. It is a vibration that creates the illusion of separation and thus a challenge toward awakening. Presently humanity is going thru a transition period into 4th dnesity reality which can account for the many rapid changes the human race is undergoing. This is the frequency that expresses the most separation from the Whole. It is from here that many lessons about integration are learned. This is the most intense of all levels in its cultivation of growth with the Self. Cetaceans (dolphins and whales) presently exist simultaneously in 3rd and 4th densities and are transiting out of 3rd along with humanity.

2nd Density
Awareness as a line, biological matter, development of species identity. The consciousness expressed by 2nd density vibration does not possess self-awareness (or ego). Most species within the plant and animal kingdoms exist here, however their placement in density depends upon many additional factors, including the presence of absence of ego.

1st Density
Awareness as a point, physical matter. This frequency level is the most basic. It provides the matter and energy for the creation of atoms and molecules. The basic life forms of mineral and water, for example, are all operating from 1st density. Humans possess this frequency within themselves as well. It makes up the basic genetic codes.


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Terminology:
Density: Density denotes a vibrational frequency and not a location, which the term "dimension" implies. The density structure of this reality is primarily expressed in seven levels, though each level has sub-levels within it. The density scale is a model used to communicate one's perception of orientation in relation to other realities.
Dimension: Dimension refers to one's location in space/time rather then a person's vibrational frequency (density). Webster defines "dimension" as "Magnitude measured in a particular direction, specifically length, breadth, thickness or time." There are an infinite number of dimensions existing with a given density or vibrational frequency.

Frequency: Matter is vibrating energy. Different vibrationary rates denote the properties. Frequency is the rate at which molecules or consciousness vibrate.

Prism of Lyra: A prism is a transparent body with a triangular base used to polarize or decompose light or energy into its spectrum. The prism of Lyra is the archetypal idea of the entrance of consciousness into this reality. For Earth's galactic family the entrance point exists within the Lyran system. As consciousness/energy emerged, it fragmented into seven density frequencies, much as a prism would fragment light in seven colors.