# What is the ideal temperature and pressure to crack water?

Using sun mirrors and solar cells for electricity. What temperature, pressure and voltage ideal for cracking water.

Source: NPR

Would it take more or less electricity to crack water under pressure or in a liquid or vapor state?

• Check this link: en.wikipedia.org/wiki/Water_splitting#Solar-thermal, how will you pass electricity through water vapors? – M. Farooq Apr 4 at 13:11
• @M.Farooq I want to say it could be done with laser filamentation. – Muze Apr 4 at 13:54
• @MaxW I don't think it so, water starts to spontaneously decay at $\approx 3000 ^\circ \rm C$. Plasma state starts to appear at $\approx 10000 ^\circ \rm C$. Mixed $\rm H$ and $\rm O$ plasma will be a neutral mix, there will be too hot for any chemical binding. – peterh Apr 4 at 20:15
• @M.Farooq It is a nice answer stub, in my opinion. I think it obviously closes out any gaseous phase. But it doesn't close out fluid water in elevated pressures. The question is, where is the efficiency optimum. – peterh Apr 4 at 20:23
• I think this question has potential, but you should organize your thoughts better so that the question is more clear. – A.K. Apr 6 at 1:40