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INFORMATIVE APPENDIX

1. The International System of Units - international system (SI)

The coordinated number of physical quantity measurement units having a description of reference basic physical quantities as well as mandatory names and designations of derived quantity units accepted by General Conference of Weights and Measures in 1960.

Quantity name

Physical dimension

Unit name

Unit designation

Russian

international

Basic units

Length

L

meter

м

m

Mass

M

kilogram

кг

kg

Time

T

second

c

s

Electric current intensity

1

Ampere

А

А

Thermodynamic

temperature

(Kelvin)

θ

kelvin

K

K

Light intensity

J

candela

кд

cd

Amount of substance

N

mol

моль

mol

Supplemental units

Plane angle

-

radian

рад

rad

Solid angle

-

steradian

ср

sr

Derived units of space and time

Square

L2

square meter

м2

м2

Volume, capacity

L3

cubic meter

м3

м3

Speed

-1

meter per second

м/с

m/s

Acceleration

LT-2

meter per second squared

м/с2

m/s2

Frequency

T-1

hertz

Гц

Hz

Angular rate

T-1

radian per second

рад/с

rad/s

Angular acceleration

T-2

radian per second squared

рад/с2

rad/s2

Wave number

L-1

reciprocal meter

м-1

m-1

Continued

Quantity name

Physical dimension

Unit name

Unit designation

Russian

international

Derived units of mechanical quantities

Density

L-3M

kilogram per cubic meter

кг/м3

kg/m3

Specific volume

L3M-1

cubic meter per kilogram

м3/кг

m3/kg

Inertia moment (dynamic)

L2M

kilogram-meter squared

кг ? м2

kg ? m2

Amount of movement (pulse)

LМT-1

kilogram-meter per second

кг?м/с

kg?m/s

Angular momentum (angular impulse)

L2MT-1

kilogram-meter squared per second

кг ? м2

kg ? m2/s

Force, weight

LMT -2

newton

N

N

Specific weight

L-2МT-2

newton per cubic meter

Н/м3

N/m3

Force moment, moment of couple

L2МT-2

newton-meter

Н ? м

N ? m

Pressure

L-1МT-2

pascal

Па

Pa

Surface tension

MT -2

newton per meter

Н/м

N/m

Work, energy

L2MT-2

joule

Дж

J

Power

L2MT-3

watt

Вт

W

Dynamic viscosity

L-1MT -1

pascal-second

Па?с

Pa?s

Kinematic viscosity

L2T -1

square meter per second

м2

m2/s

Mass flow rate

МT-1

kilogram per second

кг/с

kg/s

Derived units of electric and magnetic quantities

Current density

L-2I

ampere per square meter

А/м2

А/m2

Quantity of electricity, electric charge

ТI

coulomb

Кл

C

Electric dipole moment

LTI

coulomb-meter

Кл?м

C?m

Electric voltage, electric potential, electromotive intensity

L2МT-3I-1

volt

IN

V

Continued

Quantity name

Physical dimension

Unit name

Unit designation

Russian

international

Electric field intensity

LМT -3I -1

volt per meter

В/м

V/m

Electric capacity

L-2М-1T 4I 2

farad

Ф

F

Absolute dielectric constant

L-3M -1T 4I 2

farad per meter

Ф/м

F/m

Electric resistance

L2МT-3I -2

оhm

Оhm

Ω

Electric conductivity

L-2M -1T 3I 2

siemens

См

S

Magnetic flux

L2MT-2I -1

weber

Вб

Wb

Magnetic induction

МT-2I -1

tesla

T

T

Magnetic field intensity

L-1I

ampere per meter

А/м

A/m

Inductance

L2MT -2I -2

henry

D

H

Magnetic moment of electrical current, magnetic dipole moment

L2I

ampere-square meter

А ? м2

A ? m2

Derived units of heat quantities

Quantity of heat,

thermodynamic

potential

L2МT-2

joule

Дж

J

Heat capacity

L2MT-2 θ -1

joule per kelvin

Дж/К

J/K

Entropy

L2МT-2 θ -1

joule per kelvin

Дж/К

J/K

Specific heat capacity

L2T-2 θ -1

joule per kilogram-kelvin

Дж/ (кг ?

К)

J/(kg ? К)

Heat flux

L2MT -3

watt

Вт

W

Heat-exchange coefficient, heat-transfer coefficient

MT -3 θ-1

watt per square meter-kelvin

Вт/ (м2 ? К)

W/(m2 ? К)

Temperature gradient

L-1 θ

kelvin per meter

К/м

К/m

Thermal conductivity

LMT-3 θ-1

watt per meterkelvin

Вт/(м?К)

W/(m?К)

Derived units of light quantities

Light flux

J

lumen

лм

lm

Light energy

TJ

lumen-second

лм?с

lm?s

Light intensity

L-2J

lux

лк

lx

End of table

Quantity name

Physical dimension

Unit name

Unit designation

Russian

international

Luminance

L-2J

candella per square meter

кд/м2

cd/m2

Radiation flux

L2MT-3

Watt

Вт

W

Solar radiation

МT-3

watt per square meter

Вт/м2

W/m2

Derived units of quantities relating to ionizing radiation

Ionizing radiation energy

L2MT -2

joule

Дж

J

Flux of ionizing radiation energy

L2МT-3

watt

Вт

W

Radiation dose

L2T-2

joule per kilogram

Дж/кг

J/kg

Radiation dose rate

L2T-3

watt per kilogram

Вт/кг

W/kg

Radiation intensity

MT-3

watt per square meter

Вт/м2

W/m2

Radionuclide activity

T -1

second to the minus first

с-1

s-1

Decimal prefix to unit names

Prefix

Designation

Multiplier

Prefix

Designation

Multiplier

Russian

international

Russian

international

Tera-

T

T

1012

centi

c

c

10-2

Giga-

D

G

109

milli-

m

m

10-3

Mega

M

M

106

micro

мк

μ

10-6

kilo

k

k

103

nano

n

n

10-9

hecto

d

H

102

pico

n

p

10-12

deca

да

da

10

femto

ф

f

10-15

deci

д

d

10-1

atto

а

а

10-18

Measurement standards of basic physical quantity units SI

Meter. Length unit in SI; it is equal to a distance between axes of two lines laid on the platinum-iridium bar stored at the International Bureau of Weights and Measures at 0 °С and standard pressure. As defined, the meter is equal to

1650763.73 wavelength of radiation of Krypton-86 atom when transitioning from 2р10 level to 5d5 level in vacuum or is equal to the distance covered by light in vacuum during 1/2997922458 sec.

Kilogram. Mass unit in SI; it is equal to the mass of the international measurement standard (prototype) made of platinum-iridium alloy stored at the International Bureau of Weights and Measures. Mass of this standard is by 0.000028 kg more than mass of one cubic decimeter of chemically pure water at the temperature of its maximum density (+3.98 °С).

Second. Time unit in SI; it is equal, by atomic clock ("atomic second"), to 9192631770 periods of the radiation corresponding to the energy transition between two levels of the ground state hyperfine structure of caesium-133 atom and by ephemerid determination - 1/315569259747 part of tropical year (relative distinction between the two is ≈ 2?10-9). Second, equal to 1/86400 part of a star or average solar days, is equal to 0.99726966 atomic seconds.

Ampere. Current strength unit in SI system; it is equal to the strength of the direct current, passing which through two parallel straight conductors of infinite length and negligibly small section area, located in vacuum at a distance of 1 meter between the two, induces in the conductor section of 1 meter in length and interacting force equal to 2 ? 10-7 N. Magnetomotive force is measured in amperes too.

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