North Carolina Firefighter Hazardous Materials Practice Exam

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Dilution means

Adding water to a solution in order to decrease the concentration.

Dilution is lowering the concentration of a contaminant by adding more solvent, usually water. When you add solvent, the amount of contaminant stays the same but the total volume increases, so the amount per unit volume decreases. This helps reduce exposure or hazard if dilution is appropriate for the substance involved.

The other statements describe different ideas: removing surface contaminants from people or gear is decontamination, which is a separate process from dilution; aiming for the lowest possible contamination level as a safety goal is the ALARA principle, not dilution; and redirecting liquid flow away from people is diversion. These are not what dilution means.

The physical process of reducing or removing surface contaminants from large numbers of victims

The planned and systematic process of reducing contamination to a level that is as low as reasonably achievable

The process of redirecting liquids flow away from endangered areas (Diversion)

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