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You mean the flow rate of a volume of liquid? What are you confused about exactly?
They’re asking why it’s “standard litres per minute”, instead of just “litres per minute”
Oh, well yeah Standard liters per minute or SLM, specifically refers to flow rates measured in the U.S.
So the “other” measurement would evidently be Europes “Normal liters per minute”.
What the difference is, I couldn’t tell you.