mg/L stands for milligrams per liter and is a unit used to measure the concentration of a substance dissolved in a liquid. Regarding hydrogen water, mg/L is commonly used to describe the amount of dissolved molecular hydrogen (H₂) present in a specific volume of water.
For hydrogen-rich water, mg/L indicates how many milligrams of molecular hydrogen are dissolved in one liter of water. It is one of the standard ways manufacturers and researchers report hydrogen concentration.
Because molecular hydrogen is a gas, measuring its concentration helps determine how much dissolved H₂ is available in the water at the time of testing.
Wichtigste Erkenntnisse
- mg/L means milligrams per liter and measures dissolved hydrogen concentration.
- 1 mg/L of dissolved molecular hydrogen is approximately equal to 1 PPM.
- A higher mg/L value means more dissolved H₂ was detected during measurement.
- Hydrogen concentration can decrease over time as dissolved gas escapes.
Why Is mg/L Used to Measure Hydrogen Water?
Molecular hydrogen is a dissolved gas, so its concentration needs to be measured using specific units.
mg/L is commonly used because it provides a direct measurement of the mass of dissolved hydrogen in a given volume of water.
Scientists and manufacturers use mg/L when:
- Testing the concentration of hydrogen in water
- Comparing different hydrogen-water products
- Evaluating hydrogen-water-generating devices
- Measuring dissolved hydrogen levels during experiments
- Reporting hydrogen concentrations in scientific studies
A measured concentration provides more useful information than general marketing terms because hydrogen levels can vary between different products and preparation methods.
How Is mg/L Different From PPM in Hydrogen Water?
Unter hydrogen water, mg/L and PPM are often used interchangeably because they represent nearly the same concentration value in water.
The relationship is:
1 mg/L ≈ 1 PPM
For example:
- 0.5 mg/L hydrogen ≈ 0.5 PPM
- 1 mg/L hydrogen ≈ 1 PPM
- 2 mg/L hydrogen ≈ 2 PPM
Although the units are technically different, the similarity exists because the density of water is close to one kilogram per liter.
PPM is often used in consumer products, while mg/L is commonly seen in scientific and technical measurements.
Why Does mg/L Decrease Over Time?
Molecular hydrogen is a small gas molecule that can gradually escape from water when exposed to the surrounding environment.
The mg/L concentration may decrease when hydrogen water is:
- Left open in a container
- Stored for long periods
- Exposed to heat
- Transferred between containers
- Repeatedly shaken or poured
Because dissolved hydrogen naturally escapes, freshly prepared hydrogen water usually contains the highest concentration.
Proper storage, such as using suitable containers designed to reduce gas loss, may help maintain hydrogen levels for longer.
mg/L vs pH in Hydrogen Water
| Measurement | What It Shows | Meaning in Hydrogen Water |
|---|---|---|
| mg/L (milligrams per liter) | Measures dissolved molecular hydrogen (H₂) concentration | Indicates how much molecular hydrogen gas is present in the water at the time of measurement |
| pH | Measures acidity or alkalinity based on hydrogen ions (H⁺) | Shows whether water is acidic, neutral, or alkaline, but does not indicate the amount of dissolved hydrogen |
Related Terms
Sources and Further Reading
- Dewangan, S. K., Shrivastava, S. K., Tigga, V., Lakra, M., Namrata, & Preeti. (2023). Role of pH in water quality… International Advanced Research Journal in Science, Engineering and Technology, 10(6), 215–218.
- Ge, L., Yang, M., Yang, N.-N., Yin, X.-X., & Song, W.-G. (2017). Molecular hydrogen… Oncotarget, 8(60), 102653–102673.
- Yıldız, F., LeBaron, T. W., & Alwazeer, D. (2025). Review of molecular hydrogen as a novel nutrition therapy… Biochemistry and Biophysics Reports, 41, 101933.
