One grain per gallon is equivalent to how many parts per million?

One grain per gallon is equivalent to approximately 17 parts per million (ppm). This conversion is based on the relationship between grains, gallons, and the metric measurement of parts per million.

When discussing water quality, a grain is a measure of mass that is commonly used in water treatment contexts, whereas parts per million is a way of expressing very dilute concentrations of substances. To convert grains per gallon to ppm, it's important to know that there are 8.34 pounds in a gallon of water. Given that there are 7000 grains in a pound, one grain in a gallon translates to about 17 ppm. This conversion is particularly relevant in assessing water hardness or concentrations of dissolved substances, making it crucial knowledge for those working in water treatment and analysis.

Understanding this conversion helps in calculating and analyzing water quality to ensure it meets standards for safety and usability.