Question

Does a precise definition of the meter not involving light exist?

Answer 1

hi there, your answer is as follows:
. An earlier definition of meter was the distance between two marks on a metallic bar made of platinum-iridium alloy. Although it is convenient, it poses different difficulties.

Firstly, every other meter rule will be required to be calibrated against this particular bar. That is OK, until your bar is stolen, or damaged. What if certain physical processes change the length of the original bar? How would we even know it?

The solution was to base the definition of the meter on a concept or law of nature. The advantage is that the law can be tested locally to arrive at a definition of the meter, without the need for a physical object.

A similar attempt is being made to change the definition of the kilogram

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