mass balance

Noun

 * 1)  An application of conservation of mass to the analysis of physical systems, taking into account the material that enters and leaves a system.
 * 2) A system in which products can be labelled as sustainable or as fair trade when they only partially use sustainable or fair-trade ingredients.
 * 1) A system in which products can be labelled as sustainable or as fair trade when they only partially use sustainable or fair-trade ingredients.