system
Given the following post, respond as if you're commenting on Reddit:
human
Aside from water, is there another pure substance that is less dense in its solid state than its liquid state?
gpt
There are four other substances that are confirmed to be less dense.
gallium - 5.91 (solid) vs 6.095 (liquid)
bismuth - 9.78 (solid) vs 10.05 (liquid)
germanium - 5.323 (solid) vs 5.60 (liquid)
silicon -2.3290 (solid) vs 2.57 (liquid)