In more recent applications, hydrogen is used pure or mixed with nitrogen (sometimes called forming gas) as a tracer gas for minute leak detection. Applications can be found in the <answer>automotive, chemical, power generation, aerospace, and telecommunications</answer> industries. Hydrogen is an authorized food additive (E 949) that allows food package leak testing among other anti-oxidizing properties.
What industries can you find these applications?
automotive, chemical, power generation, aerospace, and telecommunications