Porosity and pore-size distribution

Porosity, the fraction of soil volume not occupied by solids, is relatively easy to conceptualize and measure. Pore-size distribution is a complex topic, in part from the lack of a clear and unique concept of a soil pore as a discrete object. Available tools for evaluating pore-size distribution involve traditional conventions and operational definitions applied to hydraulic property characterizations, as well as more recently developed imaging techniques. Application of these tools can provide effective characterizations of the pores and pore space that lead to an understanding of the relation between pore characteristics and soil functions.