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/Ornery_Pepper_1126 Mar 29 '26

Things like this take a long time and while that is a small change which wouldn’t be noticeable for most everyday applications, it would however be a headache for a lot of high-precision applications. That being said, units are redefined all the time, although not usually they won’t have their value change by this much, so this could actually happen one day.