Calculate pressure generated by fixed volume water in closed container

[asimpson]

sorry but I was never any good at thermodynamics but I need to show prove to some one that a fixed ammount of water in closed container can build up to explosive pressures if heated from 20 C to over 500 C.

Could anybody point me in the correct direction to calculate pressure generated.


Many thanks

 

[drawoh]

PV = nRT
...

I was under the impression that a vapour was something that does approximate gas laws closely enough for that calculation.

JHG

 

[asimpson]

thanks everyone. Very helpful.

 

[zekeman]

" PV = nRT
...


I was under the impression that a vapour was something that does approximate gas laws closely enough for that calculation"


Only over a short temperature range. R varies over temperature and pressure, making this law limited in application.

 

[rb1957]

i thought R was a function of temp and pressure (rather than a universal constant), but i'd expect you can iterate to a solution pretty quickly (that it is a well controlled function, with low derivatives).

 

[cloa]

R is a constant- what you are thinking of is that real gases are modelled by equations of state with all sorts of corrections.