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.
Between 30 June 1990 and 30 June 2010, the proportion of Australia's population aged 15-64 years has remained relatively stable, increasing from 66.9% to 67.5% of the total population. The proportion of people aged 65 years and over has increased from 11.1% to 13.6%.n the 12 months to 30 June 2010, the number of people aged 65 years and over in Australia increased by 94,800 people, representing a 3.3% increase. The proportion of the population aged 65 years and over increased from 11.1% to 13.5% between 30 June 1990 and 30 June 2010.