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- SI units (used mostly in physics):
- length: meter (m)
- mass: kilogram (kg)
- time: second (s)

**mks**sytem for**m**eter-**k**ilogram-**s**econd. - Gaussian units (used mostly in chemistry):
- length: centimeter (cm)
- mass: gram (g)
- time: second (s)

**cgs**system for**c**entimeter-**g**ram-**s**econd. - British engineering system:
- length: foot (ft)
- mass: slug
- time: second (s)

10/9/1997