text: i need to create a demonstration for the triple point of water, does anybody have an idea?   use the "triple point cell"  http://www.its-90.com/wtpguide.html  ----addition--------  another possibility might be to run computer simulations based on the lennard-jones potential.  http://en.wikipedia.org/wiki/lennard-jones_potential  i grant you that it could be tricky. it's just an idea.