Basic Chemistry for Understanding Molecular Hydrogen

What Is “ppm”? The ppm is an acronym for “parts per million”, a unit of measure that describes how much of one substance (called the “solute”) is dissolved in a sample of water (called the “solvent”). This is a measurement of concentration (or density), which can often be helpful in our daily lives. The ppm…

HYDROGEN GAS IN THE WATER The manner in which hydrogen gas is dissolved in the water has an effect on its stability and rate of exsolution (coming out of solution) and dissipation. Hydrogen gas can exist in water as fully dissolved gaseous solutes, colloidal and suspension forms, as well as large macrobubbles that exit almost…

INTRODUCTION The concentration of hydrogen gas (H2) is often reported in molarity (moles/liter (M) or milimoles/L mM), parts per million (ppm), parts per billion (ppb) or miligrams per liter (mg/L). In dilute concentrations, 1 ppm is about the same as 1 mg/L and they are often used interchangeably. The molar mass of molecular hydrogen is…