Demo

Import module

>>> from electronvolt import *

Rest mass of an electron

>>> me
9.1093837015e-31 * kg

Rest energy of the electron, in SI units

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

In mega electronvolts

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

This matches the electron rest energy on Wikipedia.

Usage

Install via pip install electronvolt.

Alternatively, run this module online

Typically loads within 3 minutes.
Shift+enter to run a block of code. Run first block to initialize the calculator.

Units and Constants

Name	Symbol	Value	Unit

Math Constants
	`pi`	3.141592653589793
Euler's number	`euler`	2.718281828459045

Metric Prefixes
	`yotta`	1 `e+24`
	`zetta`	1 `e+21`
	`exa`	1 `e+18`
	`peta`	1 `e+15`
	`tera`	1 `e+12`
	`giga`	1 `e+09`
	`mega`	1000000
	`kilo`	1000
	`hecto`	100
	`deca`	10
	`deci`	0.1
	`centi`	0.01
	`milli`	0.001
	`micro`	1 `e-06`
	`nano`	1 `e-09`
	`pico`	1 `e-12`
	`femto`	1 `e-15`
	`atto`	1 `e-18`
	`zepto`	1 `e-21`
	`yocto`	1 `e-24`

Common Prefixes
	`hundred`	100
	`thousand`	1000
	`million`	1000000
	`billion`	1 `e+09`
	`trillion`	1 `e+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 `e-06`	`s`
nanosecond	`ns`	1 `e-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 `e-06`	`m`
nanometer	`nm`	1 `e-09`	`m`
picometer	`pm`	1 `e-12`	`m`
femtometer	`fm`	1 `e-15`	`m`

Frequency
hertz	`Hz`	1	`s-1`
kilohertz	`kHz`	1000	`s-1`
megahertz	`MHz`	1000000	`s-1`
gigahertz	`GHz`	1 `e+09`	`s-1`
terahertz	`THz`	1 `e+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` `m2` `s-2`
watt	`W`	1	`kg` `m2` `s-3`

Thermodynamics
Planck constant	`h`	6.62607015 `e-34`	`kg` `m2` `s-1`
reduced Planck constant	`hbar`	1.05457181765 `e-34`	`kg` `m2` `s-1`
Avogadro constant	`NA`	6.02214076 `e+23`	`mol-1`
Boltzmann constant	`kB`	1.380649 `e-23`	`kg` `m2` `s-2` `K-1`
ideal gas constant	`R`	8.31446261815324	`kg` `mol-1` `K-1` `m2` `s-2`

Electromagnetism
coulomb	`C`	1	`s` `A`
volt	`V`	1	`kg` `A-1` `m2` `s-3`
farad	`F`	1	`kg-1` `A2` `m-2` `s4`
	`Ohm`	1	`kg` `A-2` `m2` `s-3`
tesla	`T`	1	`kg` `A-1` `s-2`
weber	`Wb`	1	`kg` `m2` `s-2` `A-1`
henry	`H`	1	`kg` `A-2` `m2` `s-2`
speed of light	`c`	299792458	`m` `s-1`
vacuum magnetic permeability	`mu0`	1.25663706212 `e-06`	`kg` `A-2` `m` `s-2`
vacuum electric permittivity	`epsilon0`	8.8541878128 `e-12`	`kg-1` `m-3` `s4` `A2`
Coulomb constant	`k`	8987551792.26078	`kg` `m3` `s-4` `A-2`
elementary charge	`e`	1.602176634 `e-19`	`s` `A`

Imperial Units
inch ('in' is a python keyword)	`in_`	0.0254	`m`
foot	`ft`	0.3048	`m`
yard	`yd`	0.9144	`m`
mile	`mi`	1609.344	`m`
	`acre`	4046.8564224	`m2`
nautical mile	`NM`	1852	`m`
knot	`kn`	0.514444444444445	`m` `s-1`
US gallon	`gal`	0.003785411784	`m3`
pound-mass	`lb`	0.45359237	`kg`
pound-force	`lbf`	4.4482216152605	`kg` `m` `s-2`
	`slug`	14.59390293720637	`kg`
	`blob`	175.1268352464764	`kg`

Common Units
kilometer per hour	`kph`	0.277777777777778	`m` `s-1`
miles per hour	`mph`	0.44704	`m` `s-1`
	`gram`	0.001	`kg`
liter	`L`	0.001	`m3`
pound per square inch	`psi`	6894.757	`kg` `m-1` `s-2`
kilowatt-hour	`kWh`	3600000	`kg` `m2` `s-2`
hectare	`ha`	10000	`m2`

Atomic Physics
electron rest mass	`me`	9.1093837015 `e-31`	`kg`
proton mass	`mp`	1.67262192369 `e-27`	`kg`
neutron mass	`mn`	1.67492749804 `e-27`	`kg`
atomic mass unit	`u`	1.6605390666 `e-27`	`kg`
atomic mass of hydrogen	`mH`	1.6735327848 `e-27`	`kg`
atomic mass of helium	`mHe`	6.64647698905 `e-27`	`kg`

Quantum Mechanics
Stefan-Boltzmann constant	`sigma`	5.67037441918 `e-08`	`kg` `K-4` `s-3`
Bohr radius	`a0`	5.29177210906 `e-11`	`m`
hydrogen ground state energy	`hground`	-2.1798723611 `e-18`	`kg` `m2` `s-2`
fine-structure constant	`alpha`	0.007297352569278
Rydberg constant	`Rydberg`	10973731.56807162	`m-1`

Radioactive Decays
becquerel	`Bq`	1	`s-1`
curie	`Ci`	3.7 `e+10`	`s-1`
millicurie	`mCi`	37000000	`s-1`
microcurie	`uCi`	37000	`s-1`

Nuclear Physics
electronvolt	`eV`	1.602176634 `e-19`	`kg` `m2` `s-2`
kilo-electronvolt	`keV`	1.602176634 `e-16`	`kg` `m2` `s-2`
mega-electronvolt	`MeV`	1.602176634 `e-13`	`kg` `m2` `s-2`
giga-electronvolt	`GeV`	1.602176634 `e-10`	`kg` `m2` `s-2`
tera-electronvolt	`TeV`	1.602176634 `e-07`	`kg` `m2` `s-2`
electronvolt per speed of light	`eVpc`	5.34428599268 `e-28`	`kg` `m` `s-1`
mega-electronvolt per c	`MeVpc`	5.34428599268 `e-22`	`kg` `m` `s-1`
electronvolt per c squared	`eVpc2`	1.78266192163 `e-36`	`kg`
mega-electronvolt per c squared	`MeVpc2`	1.78266192163 `e-30`	`kg`

Cosmology
gravitational constant	`G`	6.6743 `e-11`	`kg-1` `m3` `s-2`
astronomical unit	`au`	149597870700	`m`
light-year	`ly`	9460730472580800	`m`
parsec	`pc`	3.08567758149 `e+16`	`m`
megaparsec	`Mpc`	3.08567758149 `e+22`	`m`
Hubble parameter	`H0`	2.3333610884 `e-18`	`s-1`

More Demo

Import `ufloat` from uncertainties

>>> from uncertainties import ufloat

Rest mass of an electron

>>> me = ufloat(9.1093837015, 0.0000000028) * 1e-31 * kg

Rest energy of the electron

>>> me * c**2
(8.1871057768+/-0.0000000025)e-14 * kg * s**-2 * m**2

This matches the electron rest energy on the same Wikipedia page.

Metadata

Release files for electronvolt 1.5.11

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for electronvolt 1.5.11
File	Size	Uploaded
electronvolt-1.5.11.tar.gz	8.9 kB	Dec 4, 2021	Details

Built distribution (wheel)

Table of built distributions (wheels) for electronvolt 1.5.11
File	Interpreter	ABI	Platform	Reset
electronvolt-1.5.11-py3-none-any.whl 8.8 kB Dec 4, 2021	Python 3	none	any	Details

Total release size: 17.7 kB

Release files / electronvolt-1.5.11.tar.gz

Download URL	electronvolt-1.5.11.tar.gz
Size	8.9 kB
Tags	Source
SHA-256 checksum How to use checksums	`2ef2a2cdfe2414011fc35d1c1b5f1926c18f886ae14005264c44623d4dae2859`
BLAKE2b-256 checksum How to use checksums	`af5cc69fe3934e9045f090c6084a4d3cb2597e029cc42486d9f761d3f8d5e03f`
Upload date	Dec 4, 2021
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/3.7.0 importlib_metadata/4.8.2 pkginfo/1.8.2 requests/2.26.0 requests-toolbelt/0.9.1 tqdm/4.62.3 CPython/3.10.0`

Release files / electronvolt-1.5.11-py3-none-any.whl

Download URL	electronvolt-1.5.11-py3-none-any.whl
Size	8.8 kB
Tags	Python 3
SHA-256 checksum How to use checksums	`18d31550fde1122554f0be5d78dce35a8ba44fd3dd57dcd696a413d01646845c`
BLAKE2b-256 checksum How to use checksums	`3e9f09ca801773fe6df4073ad76d14d600b1833d0a3c6115fe81b1938de8a79c`
Upload date	Dec 4, 2021
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/3.7.0 importlib_metadata/4.8.2 pkginfo/1.8.2 requests/2.26.0 requests-toolbelt/0.9.1 tqdm/4.62.3 CPython/3.10.0`