Turning-Over (Umschlagen)
Hegel (Logic of Measure)
The qualitative leap arising from quantitative change. Quantity turns over into quality - for instance, water turning to steam at 100°C. The turning-over shows the dialectical unity of quantity and quality.
Origin
Hegel's concept for the sudden change of quality. Engels turns it into a "law of dialectics."
In Hegel
Enz. §109; Science of Logic Vol. 1, Measure