Understanding interactive behaviors: Looking at six mirrors of the classroom

In a two or more stage isotope separation plant using hydrogen sulfide and water in hot and cold exchange zones, for the separation of deuterium (heavy water), in which one first stage portion passes isotope enriched fluid in the form of gas to a second dual temperature isotope concentration stage, the enrichment throughput of the second stage is supplemented by also passing isotope enriched liquid to the second stage. This permits enlargement of an existing plant by expansion of the first stage capacityonly, and providing carry-over of enrichment to the unenlarged second stage in the form of gas and liquid.