concentration
n//ˌkɑn.sənˈtɹeɪ.ʃən//koncentration
The act, process or ability of concentrating; the process of becoming concentrated, or the state of being concentrated.
The act or process of removing the dress of ore and of reducing the valuable part to smaller compass, as by currents of air or water.
The proportion of a substance in a whole.
(physical chemistry) The amount of solute in a solution measured in suitable units (e.g., parts per million (ppm))