Divide weight by volume and you have your density.

There is no weighting by volume applied.

For staining, eosin Y is typically used in concentrations of 1 to 5 percent weight by volume, dissolved in water or ethanol.

Weighting by volume is unnatural in the local point of view where inflation is not eternal-it eventually ends as seen by any single observer.

It is unclear how temperature and depth would impact the volatility of benzene, so assumptions have been made that benzene in oil (1% weight by volume) would not volatilize before equilibrating with water.