Explanatory notes
… fats), for cracking petroleum products, in the synthesis of ammonia, for cutting or welding metals (oxy‑hydrogen blow … the action of high voltage discharges. (1) Helium (non‑inflammable, used, e.g., for inflating balloons). (2) Neon … cylinders. Nitrogen is chiefly used for the manufacture of ammonia and calcium cyanamide, but is also used to provide …