When a flight has to declare an emergency, they are asked for souls on board and fuel remaining. Sometimes the ATC will want fuel in minutes (or hours) and sometimes in pounds.
Could we get a description of why there is no standard for the fuel remaining description? In other words, why sometimes time remaining and other times weight?
(NOTE: I've tagged this FAA-regulations, because I mostly listen to RealATC, or variants, of US ATC, but this question shouldn't be limited to FAA Regs)