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Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.

3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

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electron classical radius
Symbol:  re 
Category:  Length 
SI Equivalent:  2.81794×10-15 m
Dimension
 
Notes
Fundamental physical constant
Convert     re  
1 re =
Length
  Symbol Unit Name
5.32514×10-5  a.u., a0, b  a.u. of length 
2.81794×10-5  Å  angstrom 
9.68737×10-12  arcmin  arcmin 
1.88368×10-26  AU, UA  astronomical unit 
2817.94  am  attometer 
3.32828×10-13    barleycorn (UK) 
5.32514×10-5  a0, b  bohr (first Bohr radius) 
7.70434×10-17    bolt (US cloth) 
1.33131×10-12  line (UK)  button (UK) 
4.4377×10-12  line (US)  button (US) 
1.52157×10-17    cable length (int.) 
1.52059×10-17    cable length (UK) 
1.28406×10-17    cable length (US) 
1.10943×10-11  caliber, cin  caliber (centiinch) 
2.81794×10-13  cm  centimeter 
9.24521×10-17  ch  chain (engineer's) 
1.40079×10-16  ch  chain (Gunter's) 
9.24521×10-17  ch  chain (Ramsden's) 
1.40079×10-16  ch  chain (surveyor's) 
6.16348×10-15    cubit (UK) 
2.81794×10-16  dam  decameter 
2.81794×10-14  dm  decimeter 
2.46539×10-15    ell 
6.68154×10-13    ems (pica) 
2.81794×10-33  Em  exameter 
1.54087×10-15  fath  fathom 
2.81794  fm  femtometer 
2.81794  F, f  fermi 
5.32514×10-5  a0, b, a.u.  first Bohr radius 
9.24521×10-15  ft  foot 
8.45382×10-12  fr  French 
1.40079×10-17  fur  furlong (UK) 
1.40079×10-17  fur  furlong (US) 
2.81794×10-24  Gm  gigameter 
2.77356×10-14  hd  hand (UK) 
2.81794×10-17  hm  hectometer 
2.97863×10-40    hubble 
1.10943×10-13  in  inch 
2.81794×10-18  km  kilometer 
9.13232×10-35  kpc  kiloparsec 
5.83787×10-19    league (Canadian) 
5.07189×10-19  leag. (int. naut.)  league (int. naut.) 
5.83662×10-19  leag. (stat.)  league (statute, land) 
5.06865×10-19  leag. (UK, naut.)  league (UK, naut.) 
5.06865×10-19  leag. (US, naut.)  league (US, naut.) 
1.08792×10-28    light-day 
2.61101×10-27    light-hour 
1.56661×10-25    light-minute 
9.39964×10-24    light-second 
2.97863×10-31  ly  light-year 
1.33131×10-12  line (UK)  line (UK) 
4.4377×10-12  line (US)  line (US) 
9.24521×10-15    link (engineer's) 
1.40079×10-14    link (Gunter's) 
9.24521×10-15    link (Ramsden's) 
1.40079×10-14    link (surveyor's) 
2.81794×10-21  Mm  megameter 
2.81794×10-15  m  meter 
1.10943×10-7  µin  microinch 
2.81794×10-9  µm  micron 
1.10943×10-10  mil, thou  mil (thou) 
3.79695×10-19  mile (geogr.)  mile (geographical) 
1.75098×10-18  mi (int.)  mile (international) 
1.52157×10-18  mi (naut., int.)  mile (nautical, international) 
1.51885×10-18  mi (naut., teleg.)  mile (nautical, telegraph) 
1.52059×10-18  mi (naut., UK, US)  mile (nautical, UK, US) 
1.75099×10-18  mi (stat.)  mile (statute, land) 
1.75098×10-18  mi (survey, US)  mile (survey, US) 
2.81794×10-12  mm  millimeter 
2.81794×10-6  mµ, nm  millimicron 
1.2327×10-14    nail (UK) 
2.81794×10-6  nm  nanometer 
1.52157×10-18  mi (int. naut.)  nautical mile (international) 
1.52059×10-18  mi (UK, US, naut.)  nautical mile (UK, US) 
3.69809×10-15    pace (UK) 
3.69809×10-14    palm (UK) 
9.13232×10-32  pc  parsec 
5.60316×10-16  rd  perch (rod, pole) 
2.81794×10-30  Pm  petameter 
6.68151×10-13    pica 
2.81794×10-3  pm  picometer 
8.01782×10-12    point (US printer's) 
5.60316×10-16  rd  pole (rod, perch) 
2.81794×10-22    quadrant 
5.60316×10-16  rd  rod (perch, pole) 
4.62261×10-16    rope (UK) 
1.2327×10-14    span 
2.81794×10-27  Tm  terameter 
1.10943×10-10  thou, mil  thou (mil) 
2.81736×10-2  UX, X  X-unit 
3.08174×10-15  yd  yard 
2.81794×109  ym  yoctometer 
2.81794×10-39  Ym  yottameter 
2.81794×106  zm  zeptometer 
2.81794×10-36  Zm  zettameter 
Glossary
Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.

3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.