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README.md

Demo

Rest mass of an electron

>>> me
9.1093837015e-31 * kg

Speed of light

>>> c
299792458.0 * m * s**-1

Rest energy of an electron

>>> me * c**2
8.187105776823886e-14 * m**2 * s**-2 * kg

In mega electronvolts

>>> me * c**2 / MeV
0.5109989499961642

This matches the rest energy of electron on Wikipedia.

Usage

  • Install this module via pip install electronvolt.
  • Recommended to use in an interactive python environment, e.g. jupyter notebook.
  • Recommended to import via from electronvolt import *.

You can also run this module online HERE.

  • This page typically loads in 3 minutes.
  • Use shift+enter to run a block of code.
  • Run the first block to initialize the calculator.
  • Run the second block to feel how it works.

Units and Constants

Name Symbol Value Unit
Math Constants
pi 3.14159265
Euler's number euler 2.71828183
Metric Prefixes
yotta 1.00E+24
zetta 1.00E+21
exa 1.00E+18
peta 1.00E+15
tera 1.00E+12
giga 1.00E+09
mega 1000000
kilo 1000
hecto 100
deca 10
deci 0.1
centi 0.01
milli 0.001
micro 1.00E-06
nano 1.00E-09
pico 1.00E-12
femto 1.00E-15
atto 1.00E-18
zepto 1.00E-21
yocto 1.00E-24
Common Prefixes
hundred 100
thousand 1000
million 1000000
billion 1.00E+09
trillion 1.00E+12
SI Base Units
second s 1 s
meter m 1 m
kilogram kg 1 kg
ampere A 1 A
kelvin K 1 K
mole mol 1 mol
candela cd 1 cd
Time
minute 60 s
hour 3600 s
day 86400 s
week 604800 s
year 31557600 s
millisecond ms 0.001 s
microsecond us 1.00E-06 s
nanosecond ns 1.00E-09 s
Length
kilometer km 1000 m
decimeter dm 0.1 m
centimeter cm 0.01 m
millimeter mm 0.001 m
micrometer um 1.00E-06 m
nanometer nm 1.00E-09 m
femtometer fm 1.00E-15 m
Frequency
hertz Hz 1 s**-1
kilohertz kHz 1000 s**-1
megahertz MHz 1000000 s**-1
gigahertz GHz 1.00E+09 s**-1
terahertz THz 1.00E+12 s**-1
Classical Mechanics
gravitational acceleration g 9.80665 m * s**-2
newton N 1 kg * m * s**-2
pascal Pa 1 kg * m**-1 * s**-2
joule J 1 kg * m**2 * s**-2
watt W 1 kg * m**2 * s**-3
Thermodynamics
Planck constant h 6.63E-34 kg * m**2 * s**-1
reduced Planck constant hbar 1.05E-34 kg * m**2 * s**-1
Avogadro constant NA 6.02E+23 mol**-1
Boltzmann constant kB 1.38E-23 kg * m**2 * s**-2 * K**-1
ideal gas constant R 8.31446262 kg * mol**-1 * K**-1 * m**2 * s**-2
Electromagnetism
coulomb C 1 s * A
volt V 1 kg * A**-1 * m**2 * s**-3
farad F 1 kg**-1 * A**2 * m**-2 * s**4
Ohm 1 kg * A**-2 * m**2 * s**-3
tesla T 1 kg * A**-1 * s**-2
weber Wb 1 kg * m**2 * s**-2 * A**-1
henry H 1 kg * A**-2 * m**2 * s**-2
speed of light c 299792458 m * s**-1
vacuum magnetic permeability mu0 1.26E-06 kg * A**-2 * m * s**-2
vacuum electric permittivity epsilon0 8.85E-12 kg**-1 * m**-3 * s**4 * A**2
Coulomb constant k 8.99E+09 kg * m**3 * s**-4 * A**-2
elementary charge e 1.60E-19 s * A
Imperial Units
inch 0.0254 m
foot 0.3048 m
yard 0.9144 m
mile 1609.344 m
pound-mass lb 0.45359237 kg
pound-force lbf 4.44822162 kg * m * s**-2
slug 14.5939029 kg
blob 175.126835 kg
Common Units
kilometer per hour kph 0.277777778 m * s**-1
miles per hour mph 0.44704 m * s**-1
gram 0.001 kg
liter L 0.001 m**3
pound per square inch psi 6894.757 kg * m**-1 * s**-2
kilowatt-hour kWh 3600000 kg * m**2 * s**-2
Atomic Physics
electron rest mass me 9.11E-31 kg
proton mass mp 1.67E-27 kg
neutron mass mn 1.67E-27 kg
atomic mass unit u 1.66E-27 kg
atomic mass of hydrogen mH 1.67E-27 kg
atomic mass of helium mHe 6.65E-27 kg
Quantum Mechanics
Stefan-Boltzmann constant sigma 5.67E-08 kg * K**-4 * s**-3
Bohr radius a0 5.29E-11 m
hydrogen ground state energy hground -2.18E-18 kg * m**2 * s**-2
fine-structure constant alpha 0.007297353
Rydberg constant Rinfty 10973731.6 m**-1
Radioactive Decays
becquerel Bq 1 s**-1
curie Ci 3.70E+10 s**-1
millicurie mCi 37000000 s**-1
microcurie uCi 37000 s**-1
Nuclear Physics
electronvolt eV 1.60E-19 kg * m**2 * s**-2
kilo-electronvolt keV 1.60E-16 kg * m**2 * s**-2
mega-electronvolt MeV 1.60E-13 kg * m**2 * s**-2
giga-electronvolt GeV 1.60E-10 kg * m**2 * s**-2
tera-electronvolt TeV 1.60E-07 kg * m**2 * s**-2
electronvolt per speed of light eVpc 5.34E-28 kg * m * s**-1
mega-electronvolt per c MeVpc 5.34E-22 kg * m * s**-1
electronvolt per c squared eVpc2 1.78E-36 kg
mega-electronvolt per c squared MeVpc2 1.78E-30 kg
Cosmology
gravitational constant G 6.67E-11 kg**-1 * m**3 * s**-2
astronomical unit au 1.50E+11 m
light-year ly 9.46E+15 m
parsec pc 3.09E+16 m
megaparsec Mpc 3.09E+22 m
Hubble parameter H0 2.33E-18 s**-1