Returns information for a unit symbol if available. Returns as empty if the provided symbol cannot be parsed.
The units system that the unit is defined in.
The long form name of a unit.
Empty if no property is available. If two units measure different properties, it is not possible to convert between them.
The physical dimensions in terms of the base units of the system. It is only possible to convert units if they have the same dimension. Empty if the unit is a base unit.