I am confused using this units. Why this changes happened?

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    $\begingroup$ We express the MASS in kg and the WEIGHT in Newton. Sometimes in common language we say that someone weighs $x$ kg but that has nothing to do with the actual definitions of the terms weight and mass. $\endgroup$ – Jaywalker Feb 16 '16 at 6:55
  • $\begingroup$ Weight=mg where m is Mass and g is acceleration due to gravity. we know F=ma and F is Mentioned in Newton and so why wight is also mentioned in Newton $\endgroup$ – Ganesh Feb 16 '16 at 7:03
  • $\begingroup$ So what it showing in weight machine. Mass or weight? $\endgroup$ – Kanaga Senthil Raja Feb 16 '16 at 8:18
  • $\begingroup$ @KanagaSenthilRaja: See this answer. $\endgroup$ – pela Feb 16 '16 at 8:41
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    $\begingroup$ Possible duplicate of What is the difference between weight and mass? $\endgroup$ – Jon Custer Feb 16 '16 at 13:36

The change never happening the lack of distinction between the two words has always been there.
Most people are not Physicists and use the words weight and mass to mean the same thing.
The word mass is hardly ever used in conversation as it is very much a technical word.
This error is reinforced by not using a word like massing instead of weighing and having spring balances calibrated in units of mass.

  • $\begingroup$ It goes even deeper then this. In many places the law defines "kilogram" as a weight, because the word was coined before anyone was making as strong distinction as a matter of course. $\endgroup$ – dmckee --- ex-moderator kitten Feb 16 '16 at 17:43

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