Dimensions and Units 1.Magnitudes

• Typical simulation size very small

  • 100 - 1000 atoms

• Important extensive quantities small in magnitude

  • when expressed in macroscopic units

• Small numbers are inconvenient

• Two ways to magnify them

  • work with atomic-scale units
    ps, amu, nm or Å
    
  • make dimensionless with characteristic values
    model values of size, energy, mass
    

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