1. What is PPM?

PPM (parts per million) is a dimensionless quantity used to measure very dilute concentrations. For aqueous solutions, 1 mg/mL is equivalent to 1000 PPM because 1 mL of water weighs approximately 1 gram (1000 mg).

2. How Does the Conversion Work?

The conversion formula is simple:

Where:

• PPM — Parts per million (dimensionless)
• mg/mL — Milligrams per milliliter

Explanation: Since 1 mL of water weighs approximately 1 gram (1000 mg), 1 mg/mL concentration equals 1000 PPM in aqueous solutions.

3. Importance of Concentration Conversion

Details: Converting between mg/mL and PPM is essential in chemistry, environmental science, and industry when working with dilute solutions or comparing concentration units.

4. Using the Calculator

Tips: Enter the concentration in mg/mL. The calculator will automatically convert it to PPM. The input must be a positive number.

5. Frequently Asked Questions (FAQ)

Q1: Is this conversion valid for all solutions?
A: This simple conversion (multiplying by 1000) is only strictly valid for aqueous solutions where the density is approximately 1 g/mL.

Q2: How do I convert PPM back to mg/mL?
A: Simply divide the PPM value by 1000 to get mg/mL.

Q3: What about non-aqueous solutions?
A: For solutions with different densities, you need to account for the actual density of the solution in your calculations.

Q4: What's the difference between PPM and mg/L?
A: For aqueous solutions, they are numerically equivalent (1 mg/L = 1 PPM). However, PPM is dimensionless while mg/L has units.

Q5: When would I use PPM instead of mg/mL?
A: PPM is typically used for very dilute concentrations, while mg/mL is more common for higher concentrations.