This section contains most frequently used units of measurement.
See also Universal Measurement Unit Converter.
International System of Units
Quantity | Unit | ||
Name | Designation | ||
International | Russian | ||
Length | metre | m | м |
Mass | kilogram | kg | кг |
Time | second | s | с |
Electric current | ampere | А | А |
Thermodynamic temperature | kelvin | К | К |
Amount of substance | mole | mol | моль |
Luminous intensity | candela | cd | кд |
SI Derived Units
Quantity | Unit | ||
Name | Designation | ||
International | Russian | ||
Plane angle | radian | rad | рад |
Solid angle | steradian | sr | ср |
Space and Time | |||
Area | square metre | m2 | м2 |
Volume, capacity | cubic metre | m3 | м3 |
Velocity | metre per second | m/s | м/с |
Acceleration | metre per second squared | m/s2 | м/с2 |
Angular velocity | radian per second | rad/s | рад/с |
Angular acceleration | radian per second squared | rad/s2 | рад/с2 |
Periodic and related phenomena | |||
Period | second | s | с |
Frequency | hertz | Hz | Гц |
Rotational frequency | reciprocal second | s-1 | c-1 |
Wave length | metre | m | м |
Wave number | reciprocal metre | m-1 | м-1 |
Attenuation Factor | reciprocal second | s-1 | с-1 |
Wave number, attenuation coefficient, phase coefficient, propogation coefficient, repetency | reciprocal metre | m-1 | м-1 |
Mechanics | |||
Density | kilogram per cubic metre | kg/m3 | кг/м3 |
Specific volume | cubic metre per kilogram | m3/kg | м3/кг |
Momentum | kilogram metre per second | kg•m/s | кг•м/с |
Moment of momentum, angular momentum | kilogram square metre per second | kg•m2/s | кг•м2/с |
Moment of inertia (dynamic moment of inertia) | kilogram square metre | kg•m2 | кг•м2 |
Force, weight | newton | N | Н |
Moment of force, moment of a couple, torque | newton metre | N•m | Н•м |
Impulse | newton second | N•s | Н•с |
Pressure, stress | pascal | Pa | Па |
Second moment of area, second axial moment of area, second polar moment of area | metre to the fourth power | m4 | м4 |
Section modulus | cubic metre | m3 | м3 |
Viscosity (dynamic viscosity) | pascal second | Pa•s | Па•с |
Kinematic viscosity | metre squared per second | m2/s | м2/с |
Surface tension | newton per metre | N/m | Н/м |
Work, energy, potential energy, kinetic energy | joule | J | Дж |
Power | watt | W | Вт |
Heat | |||
Temperature relative to 273.15 K | degree Celsius | °C | °С |
Linear expansion coefficient, cubic expansion coefficient, relative pressure coefficient | reciprocal kelvin | К-1 | К-1 |
Thermal gradient | kelvin per metre | K/m | К/м |
Heat, quantity of Heat | joule | J | Дж |
Heat flow rate | watt | W | Вт |
Density of heat flow rate | watt per square metre | W/m2 | Вт/м2 |
Thermal conductivity | watt per metre kelvin | W/(m•K) | Вт/(м•К) |
Coefficient of heat transfer | watt per square metre kelvin | W/(m2•K) | Вт/(м•К) |
Thermal diffusivity | square metre per second | m2/s | м2/с |
Heat capacity | joule per kelvin | J/K | Дж/К |
Specific heat capacity | joule per kilogram kelvin | J/(kg•K) | Дж/(кг•К) |
Entropy | joule per kelvin | J/K | Дж/К |
Specific entropy | joule per kilogram kelvin | J/(kg•K) | Дж/(кг1•К) |
heat, quantity of heat, energy, thermodynamic energy, enthalpy, Helmholtz function, Helmholtz free energy, Gibbs function, Gibbs free energy | joule | J | Дж |
Massic energy, specific energy, massic thermodynamic energy, specific thermodynamic energy, massic enthalpy, specific enthalpy, massic Helmholtz free energy, specific Helmholtz free energy, specific Helmholtz function, massic Gibbs free energy, specific Gibbs free energy | joule per kilogram | J/kg | Дж/кг |
Electricity and Magnetism | |||
Electric charge or quantity of electricity | coulomb | С | Kл |
Volume density of charge, charge density, volumic charge | coulomb per cubic metre | С/m3 | Кл/м3 |
Surface density of charge, electric flux density | coulomb per square metre | С/m2 | Кл/м2 |
Electric field strength | volt per metre | V/m | В/м |
Voltage | volt | V | В |
Electrical potential | volt | V | В |
Electrical potential difference | volt | V | В |
Electromotive force | volt | V | В |
Electric flux of displacement | coulomb | C | Кл |
Electric displacement | coulomb per square metre | С/m2 | Кл/м2 |
Capacitance | farad | F | Ф |
Absolute permittivity | farad per metre | F/m | Ф/м |
Electric dipole moment | coulomb metre | С•m | Кл•м |
Current density | ampere per square metre | А/m2 | А/м2 |
Linear electric current density | ampere per metre | А/m | А/м |
Magnetic field strength | ampere per metre | А/m | А/м |
Магнитодвижущая сила, разность магнитных потенциалов | ampere | А | А |
Magnetic field strength, magnetic flux density | tesla | Т | Тл |
Magnetic flux | weber | Wb | Вб |
Inductance | henry | H | Гн |
Absolute permeability | henry per metre | Н/m | Гн/м |
Electromagnetic moment, magnetic moment, magnetic area moment | ampere square metre | А•m2 | А•м2 |
Магнитный момент (кулоновскнй) | weber metre | Wb•m | Вб•м |
Magnetization | ampere per metre | А/m | А/м |
Electric resistance, impedance, reactance | ohm | Ω | Ом |
Electrical conductance | siemens | S | См |
Resistivity | ohm metre | Ω•m | Ом•м |
Conductivity | siemens per metre | S/m | См/м |
Reluctance | reciprocal henry | H-1 | Гн-1 |
Permeance | henry | Н | Гн |
Active power | watt | W | Вт |
Active energy | joule | J | Дж |
Light and Related Electromagnetic Radiations | |||
Radiant energy | joule | J | Дж |
Radiant energy fluence, radiance exposure | joule per square metre | J/m2 | Дж/м2 |
Radiant power, radiant energy flux | watt | W | Вт |
Radiant energy, fluence rate, radiant exitance, irradiance, first radiation constant | watt per square metre | W/m2 | Вт/м2 |
Radiant intensity | watt per steradian | W/sr | Вт/ср |
Radiance | watt per steradian square metre | W/(sr•m2) | Вт/(ср•м2) |
Luminous flux | lumen | lm | лм |
Quantity of light | lumen second | lm•s | лм•с |
Luminance | candela per square metre | cd/m2 | кд/м2 |
Luminous exitance | lumen per square metre | lm/m2 | лм/м2 |
Illuminance | lux | lx | лк |
Light exposure | lux second | lx•s | лк/с |
Acoustics | |||
Period, periodic time | second | s | с |
Frequency | hertz | Hz | Гц |
Sound pressure | pascal | Pa | Па |
Particle velocity (particle vibration velocity) | metre per second | m/s | м/с |
Volume flow rate | cubic metre per second | m3/s | м3/с |
Sound velocity | metre per second | m/s | м/с |
Sound energy | joule | J | Дж |
Sound energy density | joule per cubic metre | J/m3 | Дж/м3 |
Sound energy flux | watt | W | Вт |
Sound power | watt | W | Вт |
Sound intensity | watt per square metre | W/m2 | Вт/м2 |
Acoustic resistance | pascal second per cubic metre | Pa•s/m3 | Па•с/м3 |
Specific acoustic resistance | pascal second per metre | Pa•s/m | Па•с/м |
Mechanical resistance | newton second per metre | N•s/m | Н•с/м |
Equivalent absorption area of a surface or object | square metre | m2 | м2 |
Reverberation time | second | s | с |
Physical Chemistry and Molecular Physics | |||
Molar mass | kilogram per mole | kg/mol | кг/моль |
Molar volume | cubic metre per mole | m3/mol | м3/моль |
Thermal effect of a chemical reactiuon | joule | J | Дж |
Molar thermodynamic energy, chemical potential, affinity (of a chemical reaction) | joule per mole | J/mol | Дж/моль |
Molar heat capacity, molar entropy | joule per mole kelvin | J/(mol•K) | Дж/(моль•К) |
Molecular concentration | reciprocal cubic metre | m-3 | м-3 |
Mass concentration | kilogram per cubic metre | kg/m3 | кг/м3 |
Concentration | mole per cubic metre | mol/m3 | моль/м3 |
Molality. specific adsorption | mole per kilogram | mol/kg | моль/кг |
Fugacity | pascal | Pa | Па |
Osmotic pressure | pascal | Pa | Па |
Diffusion coefficient | square metre per second | m2/s | м2/с |
Скорость химической реакции | mole per cubic metre per second | mol/(m3•s) | моль/(м3•с) |
Степень дисперсности | metre to the power minus one | m-1 | м-1 |
Удельная площадь поверхности | square metre per kilogram | m2/kg | м2/кг |
Поверхностная плотность | mole per square metre | mol/m2 | моль/м2 |
Electric dipole moment of molecule | coulomb metre | C•m | Кл•м |
Electric polarizability of a molecule | coulomb square metre per volt | С•m2/V | Кл•м2/В |
Молекулярная рефракция | coulomb square metre per volt mole | C-m2/(V•mol) | Кл•м2/(В•моль) |
Ионная сила раствора | mole per kilogram | mol/kg | моль/кг |
Эквивалентная электрическая проводимость | siemens square metre per mole | S•m2/mol | См•м2/моль |
Электродный потенциал | volt | V | В |
Молярная концентрация | mole per cubic metre | mol/m3 | моль/м3 |
Подвижность ионов | square metre per volt second | m2/(V•s) | м2/(В•с) |
Ionizing Radiation | |||
Энергия ионизирующего излучения | joule | J | Дж |
Ionizing radiation | gray | Gy | Гр |
Экспозиционная доза рентгеновского и гамма-излучений | coulomb per kilogram | C/kg | Кл/кг |
Активность нуклида в радиоактивном источнике | becquerel | Bq | Бк |
Atomic and Nuclear Physics | |||
Rest mass of particle, atom, nucleus | kilogram | kg | кг |
Дефект массы | kilogram | kg | кг |
Элементарный заряд | coulomb | С | Кл |
Магнетон ядерный | ampere square metre | A•m2 | А•м2 |
Гиромагнитное отношение | ampere square metre per joule second | A•m2/(J•s) | А•м2/(Дж•с) |
Ядерный квадрупольный момент | square metre | m2 | м2 |
Энергия связи, ширина уровня | joule | J | Дж |
Интенсивность излучения (плотность потока энергии) | watt per square metre | W/m2 | Вт/м2 |
Активность нуклида (в радиоактивном источнике) | becquerel | Bq | Бк |
Удельная активность | becquerel per kilogram | Bq/kg | Бк/кг |
Молярная активность | becquerel per mole | Bq/mol | Бк/моль |
Объемная активность | becquerel per cubic metre | Bq/m3 | Бк/м3 |
Поверхностная активность | becquerel per square metre | Bq/m2 | Бк/м2 |
Период полураспада, средняя продолжительность жизни | second | s | с |
Постоянная распада | reciprocal second | s-1 | с-1 |
Эффективное сечение | square metre | m2 | м2 |
Дифференциальное эффективное сечение | square metre per steradian | m2/sr | м2/ср |
Подвижность | square metre per volt second | m2/(V•s) | м2/(В•с) |
Замедляющая способность среды | reciprocal metre | m-1 | м-1 |
Длина замедления, длина диффузии, длина миграции | metre | m | м |
Units allowed for use pari passu SI units
Quantity | Unit | ||
Name | Designation | ||
International | Russian | ||
Length | astronomical unit | AU, au, a.u., ua | a. e. |
light year | ly | св. год | |
parsec | pc | пк | |
Mass | tonne | t | т |
atomic mass unit | u | a.e. м. | |
Time | minute | min | мин. |
hour | h | ч | |
day | d | сут. | |
Plane angle | degree | .. °, | ...°, |
minute | .. ‘ , | ... '' , | |
second | ... ” , | ... ” , | |
grad (gon) | ... g (gon) | град. | |
Land Area | hectare | ha | га |
Volume, capacity | litre | l, L | л |
Energy | electron volt | eV | эВ |
Optical power | dioptre | - | дптр |
Mechanical stress | newton per square millimetre | N/mm2 | Н/мм2 |
Apparent power (in electrical engineering) | volt ampere | V•A | В•А |
Reactive power (in electrical engineering) | var | var | вар |
Metric Prefixes
Prefix | Metric prefixes | Multiplier | |
International | Russian | ||
yotta | Y | И | 1024 |
zetta | Z | З | 1021 |
exa | Е | Э | 1018 |
peta | р | П | 1015 |
tera | Т | Т | 1013 |
giga | G | Г | 109 |
mega | М | М | 106 |
kilo | k | к | 103 |
hecto | h | г | 102 |
deca | da | да | 101 |
deci | d | д | 10-1 |
centi | с | с | 10-2 |
milli | m | м | 10-3 |
micro | μ | мк | 10-6 |
nano | n | н | 10-9 |
pico | p | п | 10-12 |
femto | f | ф | 10-15 |
atto | a | а | 10-18 |
zepto | z | з | 10-21 |
yocto | y | и | 10-24 |
See also: