[himalaya]

Interesting reading, thanks Thomas.

Looks like Imperial units were defined from someone's body parts(like foot) or some animal's capability(like horsepower), while metric units were more defined from planet earth, which I guess will be more easily accepted by most residents on this planet.

1 meter = 1/10,000,000 of the length from equator to north pole.
1 ton = the weight of 1 cubic meter of water.
0℃ = freeze point of pure water under standard air presure.
100℃ = boiling point of pure water under standard air presure.