Hydrogen gas was first artificially produced in the <answer>early 16th century</answer>, via the mixing of metals with acids. In 1766–81, Henry Cavendish was the first to recognize that hydrogen gas was a discrete substance, and that it produces water when burned, a property which later gave it its name: in Greek, hydrogen means "water-former".
When was hydrogen gas artificially produced for the first time?
early 16th century