The ratio "1:100" indicates a relationship where one unit of measurement corresponds to one hundred units of another. This can be applied in various contexts, such as in finance, where it might represent a percentage, or in mapping, where one centimeter on a map equals one hundred centimeters in reality. In a practical example, if a recipe calls for a dilution of a solution at a ratio of 1:100, it means that for every one part of the solution, you would add one hundred parts of a solvent, like water. This ensures the correct concentration for effective use.