K

kelvin

Unit of thermodynamic temperature equal to the fraction 1/273.16 of the thermodynamic temperature of the triple point of water

cd

candela

Unit of luminous intensity equal to that (in the perpendicular direction) of a surface of 1/600,000 m2 of a blackbody at the temperature of freezing platinum under a pressure of 101,325 newtons per square meter (N/m2)

mol

mole

Unit of substance equal to the moment of substance of a system that contains as many elementary entities4 as there are atoms in 0.012 kg of carbon-12

"Spelled metre in countries other than the United States.

4When the mole is used, the elementary entities must be specified and may be atoms, molecules, ions, electrons, other particles, or specified groups of each particles.

"Spelled metre in countries other than the United States.

4When the mole is used, the elementary entities must be specified and may be atoms, molecules, ions, electrons, other particles, or specified groups of each particles.

TABLE 1B Supplementary SI units Symbol Unit Definition rad radian Unit of measure of a planar angle with its vertex at the center of a circle subtended by an arc equal in length to the radius sr steradian Unit of measure of a solid angle with its vertex at the center of a sphere and enclosing an area of the spherical surface equal to that of a square with sides equal in length to the radius

TABLE 2 Derived units of the SI system

Quantity

Unit

Symbol

Formula

Acceleration

meters per second per second

m/s2

Angular acceleration

radians per second per second

rad/s2

Angular velocity

radians per second

rad/s

Area

square meters

m2

Density

kilograms per cubic meter

kg/m3

Energy

joules

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