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Use "densities" in a sentence
"Yes it's true Portland is quite insistent about planning and "livability" and defends its "urban growth boundary" to the hilt -- the law that says certain densities shall not exist outside of an arbitrary line, so as to keep growth and density confined to a smaller area."
"Im mostly worried about the rankings of my frontpage so I'm going to scan the keyword densities of my frontpage and try to make them roughly the same on the redesign / expansion of the website. make sure that you preserve the URLS of the pages that rank, and add the new pages to the same URL's."
"Rods fire most in low-light situations and at changes in light densities, which is seen as motion."