I’d argue the two greatest barriers for the average, non-STEM individual adopting metric in America is the speed limits being in mph and the temperature being in °F. Both are convertible easily enough, but when you constantly have to do so to engage with critical infrastructure or safety (cooking temps, etc.) It provides a barrier against adoption for anyone without the drive to make a concerted effort to use metric.
In the UK we’re mostly using metric with the odd exception (we still love a pint of beer), one of which is that speeds are measured in MPH. It’s not really a big deal, there aren’t many customers between miles and kilometres and anything less than a km is still usually measured in metres.
I’d argue the two greatest barriers for the average, non-STEM individual adopting metric in America is the speed limits being in mph and the temperature being in °F. Both are convertible easily enough, but when you constantly have to do so to engage with critical infrastructure or safety (cooking temps, etc.) It provides a barrier against adoption for anyone without the drive to make a concerted effort to use metric.
Between the two, I think temperature is the harder one. But strangely, it also brings weight and volume back into it: Cookbooks.
So many recipes are finely tuned balances of measurements that just look plain alien when converted to metric.
In the UK we’re mostly using metric with the odd exception (we still love a pint of beer), one of which is that speeds are measured in MPH. It’s not really a big deal, there aren’t many customers between miles and kilometres and anything less than a km is still usually measured in metres.