On Sun, 24 Mar 2019 at 08:20, David C Brown wrote: > Absolutely amazing that a serious discussion on strategies for saving the > planet from global warming could - because of a joke by Prof McKay - > degenerate into a debate about making tea. > Nay sir! (Or is that "Neigh, Sir" (said with a horse laugh)) Surely it as your citing the very insightful joke that turned the tide? I'd not quite admit to the term "degenerate into". I think that some of the resultant discussion has been quite useful. But, then, I would. The "1 kWh =3D 850 litre.degrees_C" for water is an immensely useful one (f= or some, anyway). I have found many uses for it since I calculated it some years back. It's entirely obvious , but I've not seen it stated anywhere else. It's inexact due to the fact that the specific heat of water vaies somewhat across the range of usual interest, but still useful. (It's about 860 l.d at around 0C and 100C and about 850 at 40C). Neigh? Russell > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .