In acronyms, HT is short for human thermodynamics, as in EoHT (Encyclopedia of Human Thermodynamics) or IoHT (Institute of Human Thermodynamics), the thermodynamics of humans; or less-commonly hierarchical thermodynamics, the classical thermodynamic study of hierarchies of living systems, the latter a subject developed by Russian physical chemist Georgi Gladyshev. [1]

1. HT - IoHT glossary.

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