Off-topic but today I learned about "acre-feet" in stead of cubic meters. That's a funny measurement to me. 1 acre-foot (feet?) is about 1233m3 according to Go

Off-topic but today I learned about "acre-feet" in stead of cubic meters. That's a funny measurement to me. 1 acre-foot (feet?) is about 1233m3 according to Google. I always thought Americans would just use "billions of Gallons" into infinity.