4 ms·
> e.g. to convert from seconds to meters you need to use conversion factor c, which is very much not 1. SI cannot "convert from seconds to meters", since it tr
by chriswarbo 3y ago
> e.g. to convert from seconds to meters you need to use conversion factor c, which is very much not 1.
SI cannot "convert from seconds to meters", since it treats length and duration as separate dimensions. Any multiplier which turns a duration into a length must have dimension of length/duration (and hence SI units of meters/seconds); something with those units is a speed, not a conversion factor (which is dimensionless). That's not specific to any particular speed, whether c or otherwise.
- zokier 3y agoMy example was weak, but the greater point is that SIs coherence is oversold because it still requires many unnecessary (non-one) constant factors in equations; SI merely brushes the issue under the rug by labeling those as "fundamental" as if they are not almost completely arbitrary.