Type Alias Concentration 

pub type Concentration = Qty<-3, 1, 0, 0, 0, 0, 0>;

kg·m⁻³ as a concentration of one species dissolved in another.

The same dimension as Density and deliberately a distinct name: a coffee’s TDS and the density of the water carrying it are both kg/m³ and confusing them is a factor of a hundred.

Aliased Type

pub struct Concentration(/* private fields */);