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In science, unit (TR:63) (LH:#) (TL:#) refers to []


In 1973, US National Bureau of Standards published the following standard table of units, divided between nine base units and derived units:[1]

The three main base units are: mass, length, and time. The three main derived units are: force, energy, and power.


The following are quotes:

“The fractions of time and space which isolate, and which give freedom and individuality to the labile unit of social life, are indeed far larger, and perhaps more variable, than those which isolate the atoms of a chemical molecule, or the constituent parts of an ocean liner, or of a social institution, like a college, or university; but this same separating matrix is present in all these individualities, and so far as we may know, it is everywhere of precisely the same nature, immaterial and indefinable. Neither formal aggregation, nor contiguity of substance, is the basic attribute of unity and individuality, whether physical, organic, or social.”
William Patten (1920), The Grand Strategy of Evolution (pg. 381) [2]


  1. (a) Perry, John H. (1984). Perry's Chemical Engineers' Handbook (pg. 1-3). McGraw-Hill.
    (b) US National Bureau of Standards (1976), LC 1078, December.
  2. Patten, William. (1920). The Grand Strategy of Evolution: the Social Philosophy of a Biologist (pg. 381). R.G. Badger.

External links

  • Unit – Hmolpedia 2020.
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