So, why do metric road signs say, "Speed Limit 100 km/h"? Is this metric, or not? Why are not speeds expressed in seconds, or kiloseconds? The same speed could be written (approximately) as 28 km/ks. If we are going to promote the metric system, i.e. SI, and the hour is not part of SI, then shouldn't speed limits be defined in meters per second or some such?
In fact, it seems that just about anywhere SI is used, whenever times are expressed, such as for radioisotope half-lives, instead of kiloseconds, megaseconds, gigaseconds, etc., minutes, hours, days, years, etc., are used. What's the difference between using hours and using miles or pounds? John Hynes --- Bill Hooper wrote: > The problem seems to be decimalization of the way we measure time of > day (in minutes and hours). Change the minutes and hours if you wish > (they are not part of SI anyway), but leave the second (and the metre) > alone.
