I don't think it is impossible, and many products wouldn't seem to change at all. 2L of milk visually looks like about a half gallon. (I am American and moved to Norway). Canned goods look to be around the same size. And so on.
Speed limits would take a bit of getting used to in some older cars, but I think most newer cars with digital dashboards would just switch over. Buying gas would take a little time, but it'll work out. A meter isn't all that different from a yard and rulers are cheap ways to measure centimeters. Signage and things will help folks do the conversion.
Temperature and distance, however, will take a bit longer. It has taken me a while to really understand how warm 10C is without having to convert the temperature, but I'm sure we can communicate such things. I still have no real handle on how far 100km is nor how long that would take to drive, though I know it is too far to walk.
Mostly, it would take legislation and money to start changing things (signs, for example) over. This would need to happen in 2 different stages so that for a decent time, both would be shown. Some things would just be immediately updated without issue.
Some of the sticker things probably needs to be funded as well - such as gas stations. I don't think they'd need to replace the entire pump, but it is a possibility especially for older stations.
Oh, and again, legislation needs to be there. In the current political climate, this is going to be a real hurdle and I can imagine it taking a patriotic tone much like the debate of teaching cursive writing.
Speed limits would take a bit of getting used to in some older cars, but I think most newer cars with digital dashboards would just switch over. Buying gas would take a little time, but it'll work out. A meter isn't all that different from a yard and rulers are cheap ways to measure centimeters. Signage and things will help folks do the conversion.
Temperature and distance, however, will take a bit longer. It has taken me a while to really understand how warm 10C is without having to convert the temperature, but I'm sure we can communicate such things. I still have no real handle on how far 100km is nor how long that would take to drive, though I know it is too far to walk.
Mostly, it would take legislation and money to start changing things (signs, for example) over. This would need to happen in 2 different stages so that for a decent time, both would be shown. Some things would just be immediately updated without issue.
Some of the sticker things probably needs to be funded as well - such as gas stations. I don't think they'd need to replace the entire pump, but it is a possibility especially for older stations.
Oh, and again, legislation needs to be there. In the current political climate, this is going to be a real hurdle and I can imagine it taking a patriotic tone much like the debate of teaching cursive writing.