Just a little fact9 Feb 2024 20:37
The purity of commercial helium is at 99.95%.
For decades, the United States made more than 90% of commercial helium on the planet. But, Poland, Russia, and Canada produced 10% of the market share. The production of helium between 1930 and 1945 was 98% pure and only containing 2% nitrogen which was enough enough for airships. In 1945, 99% of helium produced is for welding and by 1949, commercial volume of Grade A helium was at 99.95% purity.