import javax.measure.Quantity; import javax.measure.quantity.Length; import javax.measure.unit.SI; import org.jscience.physics.model.RelativisticModel; public class MeasurementExample { public static void main(String[] args) { RelativisticModel.select(); Quantity<Length> length = QuantityFactory.getInstance(Length.class).create(1, SI.METER); Quantity<Length> kilometerLength = length.to(SI.KILOMETER); } }