Why is there no prefix for 10^5,10^-5 and 10^4 and 10^-4?

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or, why was one never adopted?
 

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Just a convention? 10^3 a time?
 
  • #3
fresh_42
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or, why was one never adopted?
Myria for ##10^4## and dimi for ##10^{-4}## have been in use in France until the middle of the 20th century.
Today we use potentials of ##10## until ##1000## and then potentials of ##1000## which makes sense to cover the different orders we face. For everyday life we still have the small ones plus some special terms like hectares or acres.
 

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