concentrations
n. C / U B2 Upper Intermediate US //ˌkɑnsənˈtɹeɪʃənz// UK //kˌɒnsəntɹˈeɪʃənz// con·cen·tra·tions
n. the amount of a substance found in a specific space or liquid. It also describes a large number of people or things gathered in one small area.
n. the relative amount of a particular substance contained within a solution or mixture; also refers to the density of occurrences or items within a specific geographic area.
The water has high concentrations of salt.
Scientists are monitoring the high concentrations of carbon dioxide in the atmosphere to track climate change.
Urban planners are concerned that high concentrations of poverty in specific neighborhoods can lead to reduced access to essential public services and employment opportunities.
Usage
Often used in the plural when referring to multiple measurements or different locations of density.