The one very good thing about Celsius scale is conversion of energy amount of heating up water to calories. Those as such are still not so useful but the conver

The one very good thing about Celsius scale is conversion of energy amount of heating up water to calories. Those as such are still not so useful but the conversion to J is still something you can do roughly in your head. (Of course, conversions between °C and °F are simple for anyone who started their learning of C from K&R).