A unit of measure for an amount-of-substance fraction.
- iOS 10.0+
- macOS 10.12+
- UIKit for Mac 13.0+Beta
- tvOS 10.0+
- watchOS 3.0+
You typically use instances of
NSUnit to represent specific quantities of dispersion using the
Dispersion describes the the amount of a constituent divided by the amount of all other constituents in a mixture. Dispersion is a dimensionless quantity that is commonly expressed in “parts-per” notation, such as “parts per million” (ppm), to describe small relative quantities.
NSUnit class defines its base unit as