First off, this is very cool, I love these kind of breakdowns from first principal.

This is sending me :)

> One cup of water becomes roughly 400 litres of steam, enough to fill two bathtubs

Three units of measurement in one sentence, my favorite unit is bathtubs.

Thanks!

RE: units - Good catch - there is almost certainly a better way to phrase this one. I always tried to give physical examples to make things more concrete. But who knows, maybe the bathtub will take off as a unit :).

Those damn imperial measurements.