it has no relation to how people live their daily lives. the whole metric thing doesn't make any difference, folks aren't doing chemistry at home..and even if they were cooking meth they could switch to the metric system in a moment it takes no effort. people know what a gallon feels and looks like, what 70 degrees f feels like hell you might even say f temperatures make more sense, the scale is generally 0-100 for most people's normal experience of real world temperatures, in other words farenheit is a human scale. the degrees make sense for our experience, not chemistry. whereas metric.. 100degree f = 37degree c, wtf is 37 degrees, it just doesn't work as well. a cool day being 70 degrees f makes more sense than 21 degrees c.