this post was submitted on 26 Sep 2023
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For what it's worth, the US doesn't use imperial anymore. It's "US Customary Units". It's mostly a mix of metric and units based on metric. The US uses volts, amps, watts, and seconds which are metric. The inch, by definition, is 25.4mm. I'm not sure how the US gallon (less volume than the Imperial gallon) is defined. Food content is given in calories and grams.
I'm also not sure how temperature is defined. Originally, temperature units were set so that fresh water boiled exactly 180 degrees above it's freezing temperature. To avoid negative numbers, zero Fahrenheit was set to the freezing temperature of sea ice.