What Is Used to Test for Hydrogen Gas? Methods for Detecting and Measuring H in Industry
Hydrogen is colourless and odourless, burns with a pale flame that is almost invisible in daylight, and forms flammable mixtures with air over a wide concentration range of roughly 4 to 75 vol.%. Its presence cannot be noticed without an instrument, so the question "is there hydrogen in the system, and how much?" is always answered by measurement.