Currently, the display for very small units is cutting them off before significant part. E.g., https://www.wikidata.org/wiki/Q483261#P2370 is displayed as:

0.0000000000 kilogram

This is obviously useless - no significant digits are displayed. Instead, some form of scientific notation should be used to display significant digits.

I assume the same issue will be occurring with very large values, but there the problem is less prominent since at least some significant digits could be seen.