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Flaffenfeit is a spoof unit that makes little sense as either length, weight, temperature or energy, like Imperial.
Unlike metric where 1cm3 of water is 1g and take 1 calorie to heat 1°C. And water freezes at 0°C and boils at 100.
With metric I can convert easily in my head, for instance adding 2dl water to 200g of flour, can be easily done on the weight without needing a measurement cup.
Likewise calculating between inch, yard, mile is not easy. Where cm, meter and km is as easy as pie.
As long as it doesn’t correlate, there’s a chance it’s right.😋