>>2409
Quantitative changes means quantitative aspects of the system such as: concentration, temperature, volume, etc. changing without the overall dynamics/properties of the system itself being changed. For example between -10 C and -1 C, ice simply gets colder without undergoing a qualitative change. It basically behaves qualitatively the same in terms of the dynamics of the molecules of the ice.
However from -1 C to +1 C, the quantitative changes to the temperature result in a qualitative change of the system from solid to liquid, where the behavior and functionality of the system are different from one state to the next.
Replace temperature with economic and sociological variables, and phase of matter with mode of production, and you get the application of dialectical materialism specifically in terms of historical materialism.
Reason I posted a sun for the OP image is because the concepts can be clearly be seen in the development of a star. There are millions of years of fuel use, changes in pressures and temperatures, punctuated by sudden qualtative changes such as supernovas, gravitational collapses, etc.