atto

• unit prefix

  • new in 1.67

  • used before many unit names to multiply by 10^-18. For example, an attometer is 0.000000000000000001 meter, or 1/1000th of a femtometer.

  • Currently the following unit names beginning with this prefix may be used: attoamp, attoampere, attoamperes, attoamps, attocoulomb, attocoulombs, attofarad, attofarads, attogram, attograms, attohenries, attohenry, attohertz, attohz, attojoule, attojoules, attoliter, attoliters, attolitre, attolitres, attometer, attometers, attometre, attometres, attonewton, attonewtons, attoohm, attoohms, attopascal, attopascals, attosec, attosecond, attoseconds, attosecs, attosiemens, attotesla, attoteslas, attovolt, attovolts, attowatt, attowatts, attoweber, attowebers, attoω

  • The full list of metric prefixes includes:

    • Prefix	Multiple
      deci	0.1
      centi	0.01
      milli	0.001
      micro	10 ^ -6
      nano	10 ^ -9
      pico	10 ^ -12
      femto	10 ^ -15
      atto	10 ^ -18
      zepto	10 ^ -21
      yocto	10 ^ -24
      deca, deka	10
      hecto	100
      kilo	1000
      mega	10 ^ 6
      giga	10 ^ 9
      tera	10 ^ 12
      peta	10 ^ 15
      exa	10 ^ 18
      zetta	10 ^ 21
      yotta	10 ^ 24