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GL F IIA2.3 Units used with the SI, and whose values in SI are obtained experimentally

The unified atomic mass unit is 1/12 of the mass of an atom of the nuclide ¹²C.

The electronvolt is the kinetic energy acquired by an electron passing through a potential difference of 1 volt in a vacuum.

Quantity

Unit

Name

Symbol

Value

Mass

unified atomic mass unit

GL F IIA2.2 Units which are defined on the basis of SI units but are not decimal multiples or submultiples thereof

Quantity

Unit

Name

Symbol

Value

Plane angle

revolution^(a)

1 revolution = 2 π rad

grade or gon

gon

1 gon = π / 200 rad

GL F IIA2.1.4 Special authorised names and symbols of decimal multiples and submultiples of SI units

Quantity

Unit

Name

Symbol

Value

Volume

litre

l or L⁽¹⁾

1 l = 1 dm³ = 10^-3 m³

Mass

tonne

1 t = 1 Mg = 10³ kg

Pressure,

GL F IIA2.1.3 Prefixes and their symbols used to designate certain decimal multiples and submultiples

Factor

Prefix

Symbol

Factor

Prefix

Symbol

10²⁴

yotta

10^-1

deci

10²¹

zetta

10^-2

centi

GL F IIA2.1.2.2 SI derived units with special names and symbols

Quantity

Unit

Expression

Name

Symbol

In other SI units

In terms of SI base units

Plane angle

radian

rad

m.m^-1

Solid angle

steradian

GL F IIA2.1.2.1 General rule for SI derived units

Units derived coherently from SI base units are given as algebraic expressions in the form of products of powers of the SI base units with a numerical factor equal to 1.