Nitrogen is pretty close to air, which is already 80% nitrogen. The gain would be minimal.<p>As for vacuum, it&#x27;s harder to maintain, and wouldn&#x27;t work anyway : <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=11593997" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=11593997</a>