Metric system brilliance
The brilliance in the metric sytem is that volume, weights and distance are combined... using the most universal thing we have all access to on earth.
Water!
The whole system is based on 1 liter (volume) which is 1 kilogram (weight) which is 1000cc (cubic centimeters which is distance)
For instance.
1 liter of water is exactly 1 kilogram
1 kilogram is 1000gram
1 liter is 1000 cc (cubic centimeters)
10mm is 1 centimeter
100cm is 1 meter
1000 meter is 1 kilometer (1.609km is 1 mile)
A huge advantage of the metric system is calculating with a simple hand calculator. Because of my work I see it done in the USA more, especially in more technical environments like calculating the capacity of cylinder heads, how much a cylinder has to be shortened to get a certain compression ratio and such.
I believe the original distance '1 meter' is kept somewhere in France.
The easiest way to measure a distance in meters to a target, or anything else, is taking a little larger than usual steps. Each step will be about a meter... depending a bit on how long your legs are.
Measuring in foots will take you a lot longer and you'll look like someone who is taking a alcohol test for a police officer
The English, or American system, is still used in Holland as well for certain measurements.
The wheel diameters of cars, motorcycles and bicycles are still in inches.
Tire width is 95% in centimeters
Computer monitors are measured in inches (but, odd enough, TV screens in centimeters!)
An adjustable wrench is still in inches too.
My father, who was a carpenter and born in 1916, talked about 'duim' (thumb) which was an inch. The 'duim' as a distance is however no longer used by carpenters in Holland as far as I know.
For those inch lovin' guys... don't kick the metric system too quickly... it's not too bad