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The letter A, the first letter of the 26-letter English alphabet, derived from the Egyptian hieroglyph of a bird.[1]

In symbols, A, from the Greek letter alpha, symbol "α", of the 27 letter Greek alphabet, numerical value "1", from the Egyptian "[add]", is first letter of the 26th letter English alphabet.


In physical chemistry, "A" is the symbol for affinity, chemical affinity, or elective affinity.

Arbeit | Work

In thermodynamics, "A", in some publications, refers to mechanical "work", from the German “Arbeit”, meaning work, and or to Helmholtz free energy, a thermodynamic formulation of affinity.


  1. Thims, Libb. (2021). Human Chemical Thermodynamics — Chemical Thermodynamics Applied to the Humanities: Meaning, Morality, Purpose; Sociology, Economics, Ecology; History, Philosophy, Government, Anthropology, Politics, Business, Jurisprudence; Religion, Relationships, Warfare, and Love (§2: Alphabet) (pdf). Publisher.

External links

  • A -- Hmolpedia 2020.
Theta Delta ics T2.jpg