4 ms·
To add to this, there are real differences between the imperial and US customary systems: http://en.wikipedia.org/wiki/Comparison_of_the_imperial_and_US_customa
by mirkules 13y ago
To add to this, there are real differences between the imperial and US customary systems: http://en.wikipedia.org/wiki/Comparison_of_the_imperial_and_US_customary_measurement_systems http://en.wikipedia.org/wiki/Comparison_of_the_imperial_and_...