Handbook of quantities

Units of mass kg Mt t q g mg u 1 kg 1 10 -9 10 -3 0.01 10 3 10 6 6.02·10 26 1 Mt 10 9 1 10 6 10 7 10 12 10 15 6.02·10 35 1 t 10 3 10 -6 1 10 10 6 10 9 6.02·10 29 1 q 100 10 -7 0.1 1 10 5 10 8 6.02·10 28 1 g 10 -3 10 -12 …

Units of velocity m/s km/s cm/s m/min km/h kn 1 m/s 1 10 -3 100 60 3.6 1.94 1 km/s 10 3 1 10 -5 6·10 4 3600 1940 1 cm/s 0.01 10 5 1 0.6 0.036 1.94·10 -2 1 m/min 1.67·10 -2 1.67·10 -5 1.67 1 0.06 3.24·10 -2 1 km/h 0.278 2…

Units of power W kW MW kgf·m/s erg/s hp 1 W 1 10 -3 10 -6 0.102 10 7 1.36·10 -3 1 kW 10 3 1 10 -3 10 2 10 10 1.36 1 MW 10 6 10 3 1 1.02·10 5 10 13 1.36·10 3 1 kgf·m/s 9.81 9.81·10 -3 9.81·10 -6 1 9.81·10 7 1.33·10 -2 1 e…

Optical quantities Name Symbol Wavelength λ Illuminance E Period of oscillation T Refractive index (refraction coefficient) n Luminous flux Ф Aperture ratio of a lens f Luminous intensity I Speed of light c Linear magnif…

Quantities of atomic physics Name Symbol Relative atomic mass A r Half-life T 1/2 Mass defect Δ Charge of the electron e Mass of an atom m a Mass of the neutron m n Mass of the proton m p Mass of the electron m e Planck …

Unit Name Symbol Russian International Ångström Å Å Are а а Astronomical unit а. е. ua Atomic mass unit а. е. м. u Technical atmosphere ат at Physical (standard) atmosphere атм atm Bar бар bar Watt Вт W Hectare га ha Hec…

Unit Name Symbol Russian International Degree Celsius °С °С Gigajoule ГДж GJ Joule Дж J Joule per kilogram Дж/кг J/kg Joule per kilogram-kelvin Дж/(кг·К) J/(kg·K) Calorie кал cal Calorie per gram кал/г cal/g Calorie per …

The first prefixes in physics were introduced in 1793—1795, when the metric system of measures was legalised in France.

Unit Name Symbol Russian International Ampere А A Ampere-second А·с A·s Watt Вт W Watt-hour Вт·ч W·h Weber Вб Wb Volt В V Gauss Гс Gs Henry Гн H Hertz Гц Hz Gigawatt ГВт GW Joule Дж J Kilowatt кВт kW Kilowatt-hour кВт·ч …

Unit Name Symbol Russian International Dioptre дптр - Candela кд cd Lux лк lx Lumen лм lm

Year Event Scientist or inventor 5th-4th centuries BC The idea was put forward that matter has a granular structure and that the atom is the simplest and indivisible particle Democritus 3rd century BC A theory of the lev…

Units of length Point 0.254 mm Line 2.54 mm Inch 25.4 mm Vershok 44.4 mm Foot 304.8 mm Arshin ≈ 71.1 cm Sazhen ≈ 213.4 cm Verst = 500 sazhens = = 1500 arshins= =1066.8 m ≈ 1.07 km Units of area Square line ≈ 6.45 mm 2 Sq…

1 nm 10 -3 1 10 10 3 10 4 10 6 1 A * 10 -4 10 -1 1 10 2 10 3 10 5 1 pm 10 -6 10 -3 10 -2 1 10 10 3 1 X-unit 10 -7 10 -4 10 -3 10 -1 1 10 2 1 fm ** 10 -9 10 -6 10 -5 10 -3 10 -2 1 * In honour of the Swedish physicist A.

The following units of length are often used to measure large distances (for example, in astronomy and astronautics): the astronomical unit, the light year and the parsec.

Units of length Mile ≈ 1.609 km Nautical mile 1.852 km (exact) Cable 185.2 m (exact) Yard 914.4 mm (exact) Foot 304.8 mm (exact) Inch 25.4 mm (exact) Large line 2.54 mm (exact) Small line ≈ 2.12 mm Units of area Acre ≈ 4…