Ohm. Because of that surface resistivity and the surface resistance are often mixed up. In order to differentiate between the two, surface resistiv-ity is often expressed also in Ohm/square (Î©/sq.) which is not a valid unit from the dimensional anal-ysis point of view. 2 Surface resistivity and surface resistance 2.1 Current density and surface cur-
The median age of the world's population was estimated to be 30.1 years in 2016, with the male median age estimated to be 29.4 years and female, 30.9 years.
About This Statistic. This statistic depicts the age distribution in the United States from 2005 to 2015. In 2015, about 18.95 percent of the U.S. population fell into the 0-14 year category, 66.26 percent into the 15-64 age group and 14.79 percent of the population were over 65 years of age.