Hi guys, This question is about the conversion between ppm and flow rate (I know you can't really convert between those two...) I have been looking on different products in the Internet, concerning the detection of a gas leak from pipes. It seems that each company is "measuring differently". Company A claims it can detect 100ppm of methane. (in air) Company B claims it can detect a flow rate of 1liter/hour of methane. (in air) How do I translate between the two? one is ppm as for concentration parameter and the other is for a flow rate. Lets say there is a wind of 10km/hr max. I thought maybe physicians could help me with that... 10x.