The formula for density is d=M/V. M represents the mass, V represents the Volume and D equals the density.
Therefore, density is the measurement that compares the amount of matter an object has to its volume. (Mass of a unit volume of a material substance.)
A board with a high amount of matter in a certain volume has high density and therefore greater stability.

Clever Flooring Type Density
Clever European Engineered Oak 750kg/m3
Clever Australian Engineered Timber Species Variable
Clever Classic Laminate 850kg/m3
Clever Hydro Laminate 950kg/m3
Clever Hybrid 2100kg/m3
Clever Bamboo 1100-1150kg/m3