Hi Pierre, You could do worse than show her the Wikipedia article https://en.wikipedia.org/wiki/Introduction_to_the_metric_system.
-----Original Message----- From: owner-u...@colostate.edu [mailto:owner-u...@colostate.edu] On Behalf Of Pierre Abbat Sent: 10 October 2015 01:25 To: U.S. Metric Association Subject: [USMA:54869] liters per square meter I've been ignoring the list because I've been busy with other things, such as surveying land. After sticking traverse nails all over the parcel of land, last week I completed a small traverse with a 78 mm misclosure and figured out that my pole is out of kilter. I am now in Germany meeting someone I know from the Internet. Several days ago in my neck of the woods in North Carolina, the forecast was 95 mm of rain. I mentioned this to her; she told me about a recent flood in France which was some large number of liters per square meter. She did not know that a liter per square meter is a millimeter. So I explained that you slice a liter (which she had trouble imagining) into 100 slices and spread them over a square meter. Pierre -- The Black Garden on the Mountain is not on the Black Mountain.