SI Brochure in the context of "Degree (angle)"

⭐ In the context of angular measurement, how is the degree of arc formally recognized by the International System of Units (SI)?

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⭐ Core Definition: SI Brochure

The International System of Units, internationally known by the abbreviation SI (from French Système international d'unités), is the modern form of the metric system and the world's most widely used system of measurement. It is the only system of measurement with official status in nearly every country in the world, employed in science, technology, industry, and everyday commerce. The SI system is coordinated by the International Bureau of Weights and Measures, which is abbreviated BIPM from French: Bureau international des poids et mesures.

The SI comprises a coherent system of units of measurement starting with seven base units, which are the second (symbol s, the unit of time), metre (m, length), kilogram (kg, mass), ampere (A, electric current), kelvin (K, thermodynamic temperature), mole (mol, amount of substance), and candela (cd, luminous intensity). The system can accommodate coherent units for an unlimited number of additional quantities. These are called coherent derived units, which can always be represented as products of powers of the base units. Twenty-two coherent derived units have been provided with special names and symbols.

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👉 SI Brochure in the context of Degree (angle)

A degree (in full, a degree of arc, arc degree, or arcdegree), usually denoted by ° (the degree symbol), is a unit of measurement of a plane angle in which one full rotation is assigned the value of 360 degrees.

It is not an SI unit—the SI unit of angular measure is the radian—but it is mentioned in the SI brochure as an accepted unit. Because a full rotation equals 2π radians, one degree is equivalent to ⁠π/180⁠ radians.

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SI Brochure in the context of Dalton (unit)

The dalton or unified atomic mass unit (symbols: Da or u, respectively) is a unit of mass defined as ⁠1/12⁠ of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest. It is a non-SI unit accepted for use with SI. The word "unified" emphasizes that the definition was accepted by both IUPAP and IUPAC. The atomic mass constant, denoted mu, is an atomic-scale reference mass, defined identically, but it is not a unit of mass. Expressed in terms of ma(C), the atomic mass of carbon-12: mu = ma(C)/12 = 1 Da. The dalton's numerical value in terms of the fixed-h kilogram is an experimentally determined quantity that, along with its inherent uncertainty, is updated periodically. As listed in the 9th edition, version 3.02, of the SI Brochure, the 2022 CODATA recommended value of the atomic mass constant expressed in the SI base unit kilogram is:

The previous value given for the dalton (1 Da = 1 u = mu) was the 2018 CODATA recommended value:

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LINKED FROM (PARENTS)
← Degree (angle) ← Dalton (unit) ← Atomic mass constant ← Degrees of arc
LINKS TO (CHILDREN)
Metric system → System of units of measurement → Science → Technology → Industry (economics) → Commerce → International Bureau of Weights and Measures → French language → Coherence (units of measurement) → Unit of measurement → SI base unit → Second → Time → Metre → Length → Kilogram → Mass → Ampere → Electric current → Kelvin → Thermodynamic temperature → Mole (unit) → Amount of substance → Candela → Luminous intensity → SI derived unit →