Each possesses a different density and crystal structure. People with cerebral palsy are at risk of low bone mineral density. Infrared communications are useful for indoor use in areas of high population density. This implies an extremely high power density. DS has a lower negative charge density overall compared to heparin. H is related to the magnetic dipole density. There were 852,278 housing units with an average density of . For conservation of the probability current density, . The district has a population density of . Polyethylene is classified by its density and branching. There were 1,639,279 housing units at an average density of . There were 61,969 housing units at an average density of . There were 27,295 housing units at an average density of . There were 13,457 housing units at an average density of . There were 61,276 housing units at an average density of .