This template provides easy inclusion of the latest CODATA recommended values of physical constants in articles. It gives the most recent values published, and will be updated when newer values become available, which is typically every four years.  The values have been updated to the CODATA 2018 values.  This includes the 2019 redefinition of SI base units, which made the values of several constants exact (e.g. e), whereas some previously exactly defined constants acquired an uncertainty (e.g. μ0).   ব্যবহার   আর্গুমেন্ট  symbol If set to yes, the value is preceded by the symbol of the constant, followed by  or  depending on whether or not round is set. round If omitted, the value is shown along with its standard uncertainty. If set to an integer n, the value is rounded to the first n digits after the decimal point (retaining trailing zeros). unit If set to no, the unit of measurement is not shown. ref If set to no, no reference is given. If set to only, only the reference is given. after Text (e.g. punctuation) to be shown after the constant before the reference. runcIf set to yes, this will provide only the relative standard uncertainty of the value and its reference.  উপলব্ধ ধ্রুবক  Code  Constant  Value  Relative standard uncertainty a0 Bohr radius  alpha fine-structure constant  A90 conventional ampere  atm standard atmosphere  bwien Wien wavelength displacement law constant  bwien' Wien frequency displacement law constant  c speed of light  c1 first radiation constant  c1L first radiation constant for spectral radiance   c2 second radiation constant    C90 conventional coulomb  DnuCs hyperfine structure transition frequency of caesium-133  e elementary charge  Eh Hartree energy  EheV Hartree energy in eV  eps0 vacuum electric permittivity  eV electronvolt  F Faraday constant  F90 conventional farad  G gravitational constant  G0 conductance quantum  g0 standard acceleration of gravity  ge electron g-factor  GF/hbarc3 Fermi coupling constant  gmu muon g-factor  gp proton g-factor  h Planck constant  H90 conventional henry  hbar reduced Planck constant  h/2me quantum of circulation  invalpha inverse fine-structure constant  invG0 inverse conductance quantum  k Boltzmann constant  KJ Josephson constant  KJ90 conventional value of Josephson constant  lP Planck length  MC12 molar mass of carbon-12  me electron mass  meDa electron mass in daltons  mmu muon mass  mn neutron mass  mnDa neutron mass in daltons  mP Planck mass  mp proton mass  mpome proton-to-electron mass ratio  mtau tau mass  Mu molar mass constant  mu atomic mass constant  muc2 atomic mass constant energy equivalent  mueV atomic mass constant energy equivalent in MeV  mu0 vacuum magnetic permeability  muB Bohr magneton  muN nuclear magneton  mW/mZ W-to-Z mass ratio  NA Avogadro constant  NAh molar Planck constant  ohm90 conventional ohm  Phi0 magnetic flux quantum  R molar gas constant  re classical electron radius  Rinf Rydberg constant  RK von Klitzing constant  RK90 conventional value of von Klitzing constant  sigma Stefan–Boltzmann constant  sigmae Thomson cross section  TP Planck temperature  tP Planck time  V90 conventional volt  VmSi molar volume of silicon  W90 conventional watt  Z0 characteristic impedance of vacuum   Examples {{ভৌত ধ্রুবক|c|unit=no|after=&nbsp;[[metre per second|metres per second]].}}  {{ভৌত ধ্রুবক|mu0|symbol=yes}}  {{ভৌত ধ্রুবক|G|symbol=yes}}  {{ভৌত ধ্রুবক|hbar|round=2|symbol=yes}}  The relative standard uncertainty of ''m''<sub>u</sub> is {{ভৌত ধ্রুবক|mu|runc=yes|after=.}} The relative standard uncertainty of mu is  For the electron mass, {{ভৌত ধ্রুবক|me|runc=yes|symbol=yes|ref=no}}. For the electron mass, . NIST publishes the CODATA value of the [[elementary charge]].{{ভৌত ধ্রুবক|e|ref=only}} NIST publishes the CODATA value of the elementary charge.   আরও দেখুন  /data, the subtemplate that holds all of the data , the older version of this template used for the 2010 values   তথ্যসূত্র