We're selective in our use of the metric system here in USA, and therefore Americans will generally have an intuitive sense for how big metric units are for som

We're selective in our use of the metric system here in USA, and therefore Americans will generally have an intuitive sense for how big metric units are for some measurements but not others. If you say 5mm or 1L, no problem. If you say 250km or 22kg, not so much. Americans have an intuitive sense for long distance in miles, small volume measurements in teaspoons or cups, distances in inches, feet, and miles. But micro distances in mm are generally okay, largely due to things like nuts and bolts being largely metric, and the proliferation of beverage containers in 1L and 2L bottles and engine displacements measured in liters give us a hand there.