NYSERDA will also require successful proposers to coordinate with regional environmental scientists to collect information that could be useful in understanding more about ecosystem function, timing and relative density of wildlife in the area, or ambient underwater noise. (nyserda.ny.gov)
There is too much turbulence in the troposphere for gases to settle out by relative densities. (illconsidered.blogspot.ru)
Many foods are water - based which means they have a relative density similar to water. (eaglepi.com)