Calculating Percent Recovery & Percent Yield. Percent Recovery: Percent recovery is used in cases where no chemical reaction is taking place, as in purification of a. sample. It is calculated as follows: % recovery =. amount pure product recovered (g) amount of crude material used (g) x 100. Percent Yield: Percent yield is used is cases where a chemical transformation occurs.
marÂ·giÂ·nal ridge. 1. An elevation of enamel that forms the proximal boundaries of the occlusal surface of premolars and molars. 2. An elevation on the mesial and distal portions of the lingual surface and, occasionally, the labial surface of incisors.
This feature is different from the supraorbital margin and the margin of the orbit. Some paleoanthropologists distinguish between torus and ridge. In anatomy, a torus is a projecting shelf of bone. Fossil hominins, in this use of the word, have the frontal torus, but modern humans only have the ridge.