Re: "Metric system is based in absolute science"
feet and ounces which differed from one region to the other
The dominant distance measure in the ancient world (the cubit - for short distances) was defined as "the length of the ruling king's forearm from the elbow to the fingertips".
Which eventually ended in a rough standard no longer based on the current king but just the kings measurements when they kinda-standardised.
 King/pharoah/emperor. Delete as applicable.