Did Lord Kelvin Say "If You Can't Measure It, It Isn't Real!"?

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SUMMARY

The phrase "If you can't measure it, it isn't real!" is commonly misattributed to Lord Kelvin, also known as William Thomson. While this sentiment aligns with Kelvin's emphasis on measurement in scientific inquiry, there is no direct evidence that he used these exact words. The Wikiquote page on William Thomson provides a quotation that conveys a similar idea but does not match the phrasing in question. This discussion highlights the importance of verifying quotes and attributions in historical contexts.

PREREQUISITES
  • Understanding of historical figures in science, specifically Lord Kelvin.
  • Familiarity with the principles of measurement in scientific methodology.
  • Basic research skills to verify quotes and attributions.
  • Knowledge of reputable sources for historical quotations, such as Wikiquote.
NEXT STEPS
  • Research Lord Kelvin's contributions to thermodynamics and measurement theory.
  • Explore the significance of measurement in scientific discourse.
  • Investigate other common misattributions in scientific history.
  • Learn how to effectively verify quotes using primary and secondary sources.
USEFUL FOR

Historians, educators, students of science, and anyone interested in the accuracy of historical quotations and their implications in scientific discussions.

klimatos
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The other day, in conversation, I attributed the dictum, "If you can't measure it, it isn't real!" to Lord Kelvin. However, when I chanced to look it up in Wiki, I could find no confirmation of this attribution. Was I mistaken? Did Lord Kelvin ever say anything to this effect? If not, is there some other source?
 
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