Summary: molar entropy is normally expressed as Joules per Kelvin per mole, but can also be expressed, more intuitively, as bits per molecule, which shows the relationship between a molecule’s properties and how much information it contains. (Contains references to two books on the topic.)
Thermodynamics post on my blog. Not directly related to rationality, but you might find it interesting if you liked Engines of Cognition.
Summary: molar entropy is normally expressed as Joules per Kelvin per mole, but can also be expressed, more intuitively, as bits per molecule, which shows the relationship between a molecule’s properties and how much information it contains. (Contains references to two books on the topic.)