Especially in conversation, but calculations are typically done in SI units to avoid mistakes. https://en.wikipedia.org/wiki/Foe_(unit) https://en.wikipedia.or

Especially in conversation, but calculations are typically done in SI units to avoid mistakes. https://en.wikipedia.org/wiki/Foe_(unit) https://en.wikipedia.org/wiki/Foe_(unit) https://en.wikipedia.org/wiki/Barn_(unit) https://en.wikipedia.org/wiki/Barn_(unit)