Why scientists are redefining the kilogram
I have always had one question about defining measurements in terms of universal constants. Perhaps it is a silly one.<p>What if universal constants are, in the long run, variable? What if over the course of 500 years the speed of light, or the strength of gravity, changes?<p>If the measurements used to define these constants are defined in terms of the constants themselves, how would we see change? Perhaps this is a silly question in practice. If so, I would be interested in the &#x27;theoretical&#x27; or hypothetical answer for a world where traditional measures of the kilogram and second have been forgotten.