Has grain
This page to collect examples and patterns of usage of the relation has_grain.
A Rector, J Rogers, T Bittner Granularity, scale and collectivity: when size does and does not matter
We use the has_grain relation to relate a material entity to each of a very large number of parts, the loss of a number of which don't effect the identity of the whole, for example blood to blood cells, or ions in a solution.
