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Question

Name the three fundamental quantities.


Solution

Definitions of three fundamental quantities:

  1. S.I. unit of length (m): A metre was originally defined in 1889 as the distance between two marks drawn on a platinum-iridium (an alloy made of 90% platinum and 10% iridium) rod kept at 0°C in the International Bureau of Weights and Measures at serves near Paris.
  2. S.I. unit of mass (kg): In 1889, one kilogramme was defined as the mass of a cylindrical piece of a platinum-iridium alloy kept at International Bureau of Weights and Measures at serves near Paris.
  3. S.I. unit of time (s): A second is defined as 1/86400th part of a mean solar day, i.e.
    1 s equals 1 over 86400 cross times o n e space m e a n space s o l a r space d a y

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