Nitrogen is pretty close to air, which is already 80% nitrogen. The gain would be minimal. As for vacuum, it's harder to maintain, and wouldn't work anyway : h

Nitrogen is pretty close to air, which is already 80% nitrogen. The gain would be minimal. As for vacuum, it's harder to maintain, and wouldn't work anyway : https://news.ycombinator.com/item?id=11593997 https://news.ycombinator.com/item?id=11593997