Systems of Units

• SI units (used mostly in physics):
  • length: meter (m)
  • mass: kilogram (kg)
  • time: second (s)
  This system is also referred to as the mks sytem for meter-kilogram-second.
• Gaussian units (used mostly in chemistry):
  • length: centimeter (cm)
  • mass: gram (g)
  • time: second (s)
  This system is also referred to as the cgs system for centimeter-gram-second.
• British engineering system:
  • length: foot (ft)
  • mass: slug
  • time: second (s)