natural unitn.

Brit.

/ˌnatʃ(ə)rəl ˈjuːnɪt/,

/ˌnatʃ(ə)rl̩ ˈjuːnɪt/, U.S.

/ˌnætʃər(ə)l ˈjunət/,

/ˌnætʃr(ə)l ˈjunət/

Origin: Formed within English, by compounding. Etymons: natural adj., unit n. and adj.

Etymology: < natural adj. + unit n. and adj.

1. A unit of measurement that is considered to be natural; esp. one based on the fundamental properties of the object, space, system, etc., under consideration.

ΚΠ

1822 N. Amer. Rev. Jan. 216 Substituting an aliquot part of the circumference of the earth, instead of a definite portion of the human body, for the natural unit of linear measure.

1853 De Bow's Rev. Feb. 131 The year is a natural unit of time.

1897 Mind 6 330 To be told that a town consists of 10,000 souls is real information, for a soul is a natural unit.

1919 Nature 6 Nov. 227/2 The suggestion, first proposed by Weiss, that there exists a natural unit of magnetism called the magneton..still lacks definite proof.

1935 L. Pauling & E. B. Wilson Introd. Quantum Mech. ii. 25 The constant of proportionality, h, is a new constant of nature,..called Planck's constant..h/2π [is] a natural unit or quantum of angular momentum.

1995 Appl. Linguistics 16 261 In this approach, a natural unit of analysis for the study of human behaviour is activity systems.

2. Physics. A unit of measurement in a system in which certain fundamental constants (the speed of light c, Planck's constant h or ℏ, and the constant of gravitation G) are set equal to unity.

ΚΠ

1955 J. M. Jauch & F. Rohrlich Theory Photons & Electrons i. 1 (heading) The natural unit system.

1963 K. Nishyima Fund. Particles i. 7 In field theory it is convenient to use the natural units: ħ = c = 1.

1993 Nature 3 June 398/1 Callan et al...study extreme charged black holes, that is, black holes whose charge is equal in magnitude to their mass (in ‘natural units’ where Planck's constant, Newton's constant and the speed of light are all set equal to unity.)

This is a new entry (OED Third Edition, June 2003; most recently modified version published online March 2022).

单词	natural unit
释义	natural unitn. Brit. /ˌnatʃ(ə)rəl ˈjuːnɪt/, /ˌnatʃ(ə)rl̩ ˈjuːnɪt/, U.S. /ˌnætʃər(ə)l ˈjunət/, /ˌnætʃr(ə)l ˈjunət/ Origin: Formed within English, by compounding. Etymons: natural adj., unit n. and adj. Etymology: < natural adj. + unit n. and adj. 1. A unit of measurement that is considered to be natural; esp. one based on the fundamental properties of the object, space, system, etc., under consideration. ΚΠ 1822 N. Amer. Rev. Jan. 216 Substituting an aliquot part of the circumference of the earth, instead of a definite portion of the human body, for the natural unit of linear measure. 1853 De Bow's Rev. Feb. 131 The year is a natural unit of time. 1897 Mind 6 330 To be told that a town consists of 10,000 souls is real information, for a soul is a natural unit. 1919 Nature 6 Nov. 227/2 The suggestion, first proposed by Weiss, that there exists a natural unit of magnetism called the magneton..still lacks definite proof. 1935 L. Pauling & E. B. Wilson Introd. Quantum Mech. ii. 25 The constant of proportionality, h, is a new constant of nature,..called Planck's constant..h/2π [is] a natural unit or quantum of angular momentum. 1995 Appl. Linguistics 16 261 In this approach, a natural unit of analysis for the study of human behaviour is activity systems. 2. Physics. A unit of measurement in a system in which certain fundamental constants (the speed of light c, Planck's constant h or ℏ, and the constant of gravitation G) are set equal to unity. ΚΠ 1955 J. M. Jauch & F. Rohrlich Theory Photons & Electrons i. 1 (heading) The natural unit system. 1963 K. Nishyima Fund. Particles i. 7 In field theory it is convenient to use the natural units: ħ = c = 1. 1993 Nature 3 June 398/1 Callan et al...study extreme charged black holes, that is, black holes whose charge is equal in magnitude to their mass (in ‘natural units’ where Planck's constant, Newton's constant and the speed of light are all set equal to unity.) This is a new entry (OED Third Edition, June 2003; most recently modified version published online March 2022). < n.1822
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