# Is it physically possible to bring water to its critical point?

I've been thinking about the critical point of water, which has three distinct and specific properties: critical temperature, critical pressure, and specific critical volume. However, when I draw a PV and TV graph I can't seem to think of any way in which to bring the water to its critical point because in order to get one property to its final state you have to change one of the others. For instance, if you already have the water at its critical temperature and pressure, you would have to decrease or increase one of those values to get it to its critical volume.

To this end, I'm wondering whether it's even possible to bring water to its critical point - because once you achieve two of the three intended properties, it seems impossible to me to get the third property to the correct state without changing one of the other two.

• You’re not using the ideal gas law, are you? Commented Jul 11, 2023 at 18:33
• No, simply thinking about the process logistically. Commented Jul 11, 2023 at 18:48
• Related: How to realize the triple point of water? I would think that heating a triple point cell would get you to the critical point in the same way. Commented Jul 11, 2023 at 19:00
• renmatix.com/understanding-supercritical-water Commented Jul 11, 2023 at 20:06
• There is no critical volume. It's just critical temperature and pressure. Critical volume may be referring to "specific volume at the critical point" Commented Jul 11, 2023 at 20:19