UEVs of Fuels and Some Common Products UEVs of Ecosystem Components Calculating UEVs from Network Flow Data Summary Comments Further Reading

most dispersed energy input to the Earth. The solar transformity of the sunlight absorbed by the Earth is 1.0 by definition.

• 'Specific emergy' is the UEV of matter defined as the emergy per mass, usually expressed as solar emergy per gram (sej g_1). Solids may be evaluated best with data on emergy per unit mass for its concentration. Because energy is required to concentrate materials, the UEV of any substance increases with concentration. Elements and compounds not abundant in nature therefore have higher emergy/mass ratios when found in concentrated form since more work was required to concentrate them, both spatially and chemically.

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