PPM stands for what?

PPM stands for what?

• A. Pounds Per Mass
• B. Parts Per Meter
• C. Pulses Per Minute
• D. Parts Per Million

Answer: (D)

PPM stands for parts per million, a unit used to express very small concentrations. It tells you how many parts of a solute are present in a million parts of solution. In greenhouse management, ppm is commonly used to specify nutrient concentrations in irrigation water; for dilute aqueous solutions, 1 ppm is roughly 1 milligram per liter, so a nutrient solution at 500 ppm contains about 500 mg of dissolved minerals per liter. Tools like TDS meters translate conductivity into ppm to help growers maintain appropriate nutrient levels.

PPM stands for parts per million, a unit used to express very small concentrations. It tells you how many parts of a solute are present in a million parts of solution. In greenhouse management, ppm is commonly used to specify nutrient concentrations in irrigation water; for dilute aqueous solutions, 1 ppm is roughly 1 milligram per liter, so a nutrient solution at 500 ppm contains about 500 mg of dissolved minerals per liter. Tools like TDS meters translate conductivity into ppm to help growers maintain appropriate nutrient levels.