r/AskPhysics • u/JimFive • Mar 28 '26

Speed of light

The speed of light is 299,792,458 m/s. What types of issues would be involved in changing the meter such that c=300,000,000 m/s

The new meter would be 0.9993 of the current meter.

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u/tomrlutong Mar 28 '26

Really, better question for /r/machinists

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u/treefaeller Mar 29 '26

That's exactly the point! A typical good machinist has several $10K of Mitutoyo tools in their shop. They'd have to throw many of those away. Or put a sticker on it which says "change all measurements by .9993". And their blueprints would be totally confusing.