Density is the ratio of a substance's mass to its volume. The symbol most often used for density is ρ, although the Latin letter D can also be used: where ρ is the density, m is the mass, and V is the volume. From Wikipedia
New data shows Bavaria leading federal states, city-states trailing, and Freyung-Grafenau topping all districts with 121 motorcycles per 1,000 residents.
