The results of sieving a soil sample can be represented by a grain size distribution diagram, also known as a sieve curve. The diagram shows which proportion of a grain mass, expressed on weight percentages, is smaller in total than a given diameter.
A steep curve shows that the soil type is even in terms of grain size. A gentle curve, on the other hand, shows that the variety of grain sizes is wider. Sieve curves can be used, for instance, to make judgements concerning the economic viability of sand extraction and the water permeability level (k-value).