Looked at from the porosity perspective, bulk density increases as pore space decreases. The relationship of bulk density and porosity is reciprocal. As one increases, the other decreases. ... Generally speaking, loose, rich in organic matter, well aggregated and porous soils have a low bulk density.

How do porosity air space and density related?

Air porosity refers to the measurement of the volume of pore space in a growing medium occupied by air after it is saturated and allowed to drain. Air porosity is calculated as a percentage of the volume of the growing medium and is inversely related to the bulk density of a growing medium.

How does porosity affect?

Porosity also significantly affects fatigue behaviour. The lower fatigue strength in P/M materials can be attributed to the presence of porosity. Fraction of porosity, pore size, pore shape, and pore spacing are all important factors that control the fatigue behavior of P/M materials.