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Hi!
Thanks, Ludwik, for advocating again the use of metric units! What
we should emphasize (for thye general publicand noit for the physicists
who already know it very well) is that the metric units are much simpler
and practical FOR EVERYDAY USE. Conversion from m to cm, mm, km etc. uses
essentially the conversion factor 1 plus a shift in the position of the
decimal point, Furthermore, the relation between for example units of
length.area and volume are immediate. Think of the nightmare of converting
cubic yards into cubic miles, gallons, fluid ounces, bushels etc.
An example: calculate the amount of rain water fallen on a highway:
a) Highway is 20 m wide, 5 km long and there was a rainfall of 2 cm
(express the volume of water in m^3, its weight in kg or tons (metric))
b) Highway is 20 yards wide, 5 miles long and the rainfall was 1 inch
(express it in gallons and in cubic miles or cubic foot, the weight
in pounds).
Good luck!! Emilio