Steam pressure curve and phase diagram of water © Siemens Stiftung 2018 CC BY-SA 4.0 international

Steam pressure curve and phase diagram of water


The steam pressure curves (p-V diagram) and the phase diagram (p-T diagram) of water are compared.

Englisch, Spanisch (CREA), Deutsch
Bild (113,1 kByte)
If you heat water to 100 °C at normal atmospheric pressure, it turns into steam. But what effect does raising or lowering the pressure have on the vaporization temperature?
The answer to this is given by the steam pressure curve (T-curves in the p-V diagram on the left) and the phase diagram (p-T diagram of the right) of the water. Steam pressure is the term for the pressure at which gas and liquid are in equilibrium, i.e. the same number of molecules evaporate as condense back into water. Above the critical temperature (numerical values are given) the water is always gaseous, regardless at what temperature, and it can be treated as a real gas (Van der Waals equation, formula is given). At every temperature below the critical temperature there is a steam pressure for which there is a two-phase zone (liquid and gaseous). In the liquid phase range it is possible to recognize from the steep rise in the curves that liquid substances are barely compressible.
The critical temperature must not be confused with the triple point temperature (see p-T diagram). This characterizes the values of temperature and pressure at which all phases (solid, liquid and gaseous) are present simultaneously.

Information and ideas:
At what temperature does water boil on Mount Everest? So-called “Steam pressure tables" provide information about this. It would also be interesting to refer to the phase transition points as temperature critical points. At the phase transition from liquid to gaseous the energy applied does not initially lead to an increase in temperature. The same applies to the melting of ice. Not until all the water has evaporated or melted does the temperature rise further.
Diesem Medium sind keine weiteren Medien zugeordnet.
Chemistry; Physics; Technology
Grade 7 to 9; Grade 10 to 13
Middle/high school; Vocational training
Chart; Energy; State of aggregation; Steam engine; Turbine; Energy conversion; Graphics; Steam engine; Turbine
Siemens Stiftung Media Portal
MediaHouse GmbH
© Siemens Stiftung 2018
Bleiben Sie auf dem Laufenden!

Etwa viermal im Jahr informieren wir Sie über neue Medien auf diesem Portal sowie aktuelle Studien und Veranstaltungen aus den Bereichen OER und MINT.

Medienportal Newsletter – jetzt anmelden

Etwa viermal im Jahr informieren wir Sie über neue Medien auf diesem Portal sowie aktuelle Studien und Veranstaltungen aus den Bereichen OER und MINT.



Liebe Nutzerin, lieber Nutzer,
El Portal de Medios – das spanische Medienportal – ist umgezogen und heißt nun CREA.
Auf CREA finden Sie weiterhin hochwertige Medien für den MINT-Unterricht und vieles mehr.

Dear User,
El Portal de Medios - the Spanish Media Portal - has moved and is now called CREA.
On CREA, you will continue to find high-quality media for STEM education and much more.

Estimado usuario, estimada usuaria,
El Portal de Medios – en español – ha sido trasladado y ahora se llama CREA.
En CREA seguirá encontrando medios de alta calidad para la enseñanza de STEM, y mucho más.

Zu CREA wechseln / Switch to CREA / Cambiar a CREA
CREA - El Portal de Medios para la Enseñanza STEM

Hierbleiben / Stay here / Quédate aquí:
Fenster schließen / Close window / Cerrar ventana