ENBUS204 Study Guide - Midterm Guide: Environmental Engineering, Leachate, Material Flow Analysis

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The term material stands for both substances and goods. Goods are substances or mixtures of substances that have economic values assigned by markets. The value can be positive (car, fuel, wood) or negative (municipal solid waste, sewage sludge). In economic terms, the word goods is more broadly defined to include immaterial goods such as energy (e. g. , electricity), services, or information. In mfa terminology, however, the term goods stands for material goods only. Nevertheless, the link between goods as defined by mfa and other goods as used by economists can be important when mfa is applied, for example, for decisions regarding resource conservation. A process is defined as a transport, transformation or storage of materials. Stocks are defined as material reservoirs (mass) within the analyzed system and they have the physical unit of kilograms. Processes are linked by flows (mass per time) or fluxes (mass per time and cross- section) of materials.

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