import type { ConcentrationInput, ConcentrationResult } from './types.js';
/**
 * Convert concentration between mol/L, wt%, and ppm.
 *
 * Formulas:
 * - mol/L = (wt% * density * 1000) / (MW * 100)
 * - wt% = (mol/L * MW * 100) / (density * 1000)
 * - ppm = wt% * 10000
 * - mol/L = (ppm * density) / (MW * 1000)
 *
 * @param input - Concentration input with source unit, value, molecular weight, and density
 * @returns All three concentration units
 */
export declare function concentration(input: ConcentrationInput): ConcentrationResult;
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