First produced by Chinese physical scientist Hu Gangfu (胡剛復) in 1923 to traslate the concept of entropy in thermodynamics, where 商 (quotient) means the quotient of heat and temperature, and 火 (fire) means it is relavent to the thermodynamics.
- KangXi: not present, would follow page 681, character 14
- Hanyu Da Zidian: volume 3, page 2229, character 14
- Unihan data for U+71B5
熵 (Yale seung1)
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