puits, tranchées au jour. Au registre des animations, un conteur vous relate contes et légendes ("Et si la mine m'était contée"), des
simple material balance to derive the average thickness h of the platey particles from projected area measurements and volume of the solid. is defined as d50(S)/h. where d50(S) is the mean projected area diameter and h the average thickness attributed to all particles occurring in the sample.