B No vacuum anywhere vs the measurement of "c"

B
Thread starter Dangoe
Start date Aug 22, 2022
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Measurement Vacuum

AI Thread Summary

The discussion revolves around the definition of the meter and the speed of light (c) in a vacuum, questioning the feasibility of achieving a perfect vacuum in the universe. Participants clarify that while an ideal vacuum may be unattainable, the concept of c refers to light traveling without significant interaction with matter, which is practically achievable in various experimental conditions. The optical extinction theorem is highlighted as a relevant framework for understanding light's behavior in less-than-perfect vacuums. Additionally, it is emphasized that scientific measurements can still be precise despite the imperfections in achieving a true vacuum. Overall, the conversation underscores the distinction between theoretical ideals and practical realizations in scientific measurement.

Aug 25, 2022

PeterDonis

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Dangoe said:

Things are still hidden from me behind a paper wall

I have no idea what you are talking about. There is copious information available online about various ways that ##c## has been measured over the past few centuries, and how the value that is now fixed in the SI unit definitions was arrived at.

If you have questions about something you read in the course of looking through all of that copious information available online, by all means start a new thread here to ask them. But to claim that you are unable to find any useful information online about the measurement of ##c## is simply not credible.

Thread will remain closed.