S.I. (Systeme International) Units

• An internationally accepted system of units for scientific measurements.

• Mass in kilograms

• Length in meters

• Time in seconds

• and many more units

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Mass, length and time are fundamental dimensions in that they represent three distinctly different methods of measurement.. The units of mass length and time are fundamental in the same sense. S. I. Units for other quantities can be derived from these fundamental units of mass length and time. For example, the Newton is the S.I. Unit of force, but 1 Newton = 1kilogram meter per square second.