Thread: Figure out the phase change temperatures at pressure P?

So, Water boils at 100C under normal sea-level air pressure. In Denver, it boils at around 95C, or something like that.
Another example is how a pressure cooker increases the temperature at which liquids boil.

The thing is I am trying to find a formula that will let me calculate the phase change temperature for object X at Pressure P, hopefully of density ρ.

Since I don't have experience in differential equations, it would be nice if I could find one that is straight boring algebra, but a differential will work if nothing else is available.

For liquid/vapor phase change google the Antoine equation.

This looks like the kind of thing I am looking for. However, A, B and C are component-specific constants. What would I use in place of these in the case of water?[/img]

Originally Posted by Leopardson

This looks like the kind of thing I am looking for. However, A, B and C are component-specific constants. What would I use in place of these in the case of water?[/img]

Why wouldn't you just want to use the steam tables for water?

Or this:

http://webbook.nist.gov/chemistry/fluid/

Steam tables in a spreadsheet.
http://www.mycheme.com/technicaldata...s-n-excel.html

Originally Posted by Harold14370

Steam tables in a spreadsheet.
http://www.mycheme.com/technicaldata...s-n-excel.html

Thanks - that's very handy.

Originally Posted by Bunbury

Originally Posted by Harold14370

Steam tables in a spreadsheet.
http://www.mycheme.com/technicaldata...s-n-excel.html

Thanks - that's very handy.

You're welcome.