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Units in the TRACI Methodology

TRACI uses different values for air acidification and water eutrophication compared to the CML methodology used in SolidWorks Sustainability.

Damage Category Unit Definition
Air Acidification mol H+ e The equivalent molar concentration of the hydrogen ion. Also referred to as the pH of a solution or the measure of the acidity or basicity of the solution.


Refers to Moles, which are the SI units of amount of substance, equal to the quantity containing as many elementary units as there are atoms in 0.012 kg of carbon-12.


Refers to ions of hydrogen


An indicator for equivalence. Although many substances contribute to the acidity of the air, the amount of each acidifying substance in the air is scaled by an equivalence factor so that a single value can be reported.

Water Eutrophication kg N e The equivalent amount of nitrogen dissolved in water measured in kilograms.

Water eutrophication occurs through the addition of artificial or natural substances, such as nitrates and phosphates, through fertilizers or sewage.

Using an equivalence factor, TRACI summates these substances to provide a measure for water eutrophication using nitrogen equivalence.

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