The Invisible Made Visible: A Look at Trace-Gas Sensing and the Hunt for Hydrogen

  Introduction: From Invisible Molecules to Actionable Intelligence The air surrounding us is a complex mixture of gases, most of which remain invisible and undetectable to human senses. Yet within this unseen layer exist signals critical to safety, environmental stability, industrial performance, and national security. The ability to detect gases at parts-per-million (ppm) and parts-per-billion…