A do-at-home demo: http://matse1.matse.illinois.edu/energy/b.html http://matse1.matse.illinois.edu/energy/b.html Note: I haven't tried these particular instruc

A do-at-home demo: http://matse1.matse.illinois.edu/energy/b.html http://matse1.matse.illinois.edu/energy/b.html Note: I haven't tried these particular instructions myself, although I did do a similar demo around 20 years ago. They used this, and maybe still do, at UIUC to heat the Vietnamese potbelly pig barns south of campus.