I suspect most people wouldn’t really know how big a gallon is either. They care about how much they pay per gallon, and they just don’t know that their electricity bill tells them how much they pay per kWh.
Americans often buy milk by the gallon and have various 1-5 gallon gas cans for common gas powered equipment (lawn mower, leaf blower, generator). I beleive a gallon is tangible here. I’m sure ~4 liters is tangible for metric countries although they often use l/100 miles so they just need to know 1 liter, which I assume many drinks are sold as such
I suspect most people wouldn’t really know how big a gallon is either. They care about how much they pay per gallon, and they just don’t know that their electricity bill tells them how much they pay per kWh.
Americans often buy milk by the gallon and have various 1-5 gallon gas cans for common gas powered equipment (lawn mower, leaf blower, generator). I beleive a gallon is tangible here. I’m sure ~4 liters is tangible for metric countries although they often use l/100 miles so they just need to know 1 liter, which I assume many drinks are sold as such