In Neu Theory, there are only two types of matter in nature, designated as Type I & Type II:

- Type I matter is always at absolute density (~ 6.693 x 10
^{17}kg/m^{3}) and a specific volume of 1.494 090 x 10^{-18}m^{3}/kg. Type I matter behaves like a incompressible homogeneous liquid analogous to liquid mercury. The elementary core [1] & the elementary membrane [2] are Type I matter. - Type II matter has a variable density (~ 9.68 x 10
^{14}kg/m^{3}– 3.33 x 10^{-10}kg/m^{3}). Type II matter behaves analogous to a homogeneous compressible gas. The elementary plasm [3] is Type II matter. The densest plasms are with Lead 208. The least dense plasms are with ultra cold neutrons.