# International Steam Tables

> Calculates thermodynamic properties of water and steam using IAPWS-IF97 formulation. (iPhone/iPad app by Hans-Joachim Kretzschmar.)

- Source: https://appshunter.io/ios/app/international-steam-tables/id502937992 (this page in markdown: same URL + `.md`)
- Developer: [Hans-Joachim Kretzschmar](https://appshunter.io/developer/502937995)
- Category: Utilities, Productivity
- Price: $2.99
- Rating: 3.90/5 from 8 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 10 MB
- Languages: American English
- Released: 2012-02-28
- Data updated: 2026-09-07
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/international-steam-tables/id502937992/reviews.md

## What is International Steam Tables?

The "International Steam Tables - IAPWS-IF97" app has been developed by active members of the International Association for the Properties of Water and Steam (IAPWS) at the Zittau/Görlitz University of Applied Sciences. The research group at the Department of Technical Thermodynamics in Zittau participated in the development of the "Industrial Formulation IAPWS-IF97 for the Properties of Water and Steam" and developed four supplementary standards for backward equations.
 
This universal app can be used on iPhone, iPad, and iPod touch, and is designed for comfortable use. The calculations of the thermodynamic properties are based on the Industrial Formulation IAPWS-IF97 and cover its full range of validity. In addition, transport properties, thermodynamic derivatives, and backward functions can be calculated.

This app is intended to be used by students and engineers in their daily work.

To learn more about the "International Steam Tables - IAPWS-IF97" app visit our website www.thermodynamics-zittau.de for a detailed User's Guide.

---------------------------------------

Features of the "International Steam Tables - IAPWS-IF97" app:
 
The following combinations of input variables can be chosen:
 
Pressure p and temperature t
Pressure p and vapor fraction x in wet steam region
Temperature t and vapor fraction x in wet steam region
Pressure p and specific enthalpy h
Pressure p and specific entropy s
Specific enthalpy h and specific entropy s
Specific internal energy u and specific volume v
Specific enthalpy h and specific volume v

The user just edits the values of the input variables and all results are calculated automatically. See the screenshots below this text for details.

Depending on the given pair of input variables the following properties will be calculated:
Pressure p or saturation pressure ps
Temperature t or saturation temperature ts
Vapor fraction x
Specific volume v
Density rho
Specific internal energy u
Specific enthalpy h
Specific entropy s
Specific isobaric heat capacity cp
Specific isochoric heat capacity cv
Isentropic exponent kappa
Speed of sound w
Isobaric cubic expansion coefficient alpha_v
Isothermal compressibility kappa_t
Thermal conductivity lambda
Dynamic viscosity eta
Kinematic viscosity ny
Prandtl number Pr
Thermal diffusivity a

The calculated properties are displayed in a scrollable view. The user just needs to scroll down to see all the results. See the screenshots below for details.

If the user switches from one input variable combination to another the previously given or calculated values will be assigned to the new input values and the output is being calculated automatically. For example, if the user calculates a certain state point from pressure p and temperature t and switches to a calculation from pressure p and specific entropy s afterwards, the previously calculated value for s (from p and t) will be assigned as input value for s. This eases the calculation of thermodynamic processes in which one property is kept constant, e. g. of an isentropic expansion.
The user can choose SI or I-P unit systems. In addition a variety of other units are available,
e.g. 
K, °C, °F, °R for Temperature, 
MPa, bar, psi, atm for pressure,
kg, lb for mass, 
kJ, Btu, ft lbf, kcal for energy.
 
All units can be selected independently but the user might also switch between SI and IP unit system for all properties with just one tap. See the screenshots below this text for details.
Unit conversions will be effective immediately.
A detailed User's Guide explains the features and capabilities of this App. View the User's guide online on www.thermodynamics-zittau.de.

## Key features

- Calculates thermodynamic properties of water and steam
- Based on IAPWS-IF97 formulation
- Supports various input variable combinations
- Automatically computes results
- Includes transport properties and derivatives
- Designed for students and engineers

## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/international-steam-tables/id502937992/reviews.md

### 1/5 — Steam properties

*2019-02-21*

The thing works OK, but a huge shortcoming is that it doesn’t have a saturated steam mode. Without referring to steam tables, you are left to guess and iterate to find the saturation temperature for a given pressure.

### 5/5 — USE THIS ONE!

*2014-10-14*

If you're an engineering student, this is the steam app you want. It includes compressed water properties too, which the other apps don't have. Almost all units available including mixing an matching of English and Standard units. Great app, I wish I had this when I took Thermo.

### 5/5 — Fast perfekt

*2012-07-01*

Die App ist ein wunderbarer Begleiter im Studium und ersetzt fast eine gedruckte Wasserdampftafel. Man kann jederzeit ohne große Interpolation Werte ablesen und durch die automatische Mitnahme der Werte in die anderen Registerkarten erspart man sich viel Tipparbeit. Solche kleinen Einbauten fehlen leider in vielen Apps und zeigen das sich hier einige Gedanken bei der Programmierung gemacht wurden und nicht einfach ein Programm geschrieben wurde. Eine Kleinigkeit wäre aber noch wünschenswert. Wie in der vorangegangenen Rezension erwähnt, wäre der Einbau einer Registerkarte bei der man durch Eingabe von Druck und Temperatur alle Prozessparamter wie h' , h" sowie s' und s" und weiterer Werte ablesen könnte wünschenswert. In der zur App gehörenden gedruckten Version als Table 1 aufgelistet. 
Wenn man zusätzlich die Registerkarte Units dadurch ersetzen könnte, dass die Einheiten durch Klicken auf Selbige geändert werden könnten, wäre die App quasi perfekt.

Trotzdem 5 Punkte

### 5/5 — works great, solid app

*2012-06-27*

this app is one of my most valuable tools. perfect for steam plant work and power systems analysis. quick, easy to use, and beats the HELL out of doing table lookups with interpolations all day. 

one suggestion for improvement would be to include "thermodynamics" in the keywords list for AppStore searching.  I almost didnt find this app? good thing I stumbled upon it.

### 5/5 — Nice for the practicing engineer!

*2012-06-13*

Spot-checked against a copy of Keenan & Keyes (1969) with good agreement. I understand that the IAPWS-IF97 formulation gives slightly different results than the classic tables ... As the joke goes, if you're worried about the fourth significant digit, you're already in trouble! Nice and useable, fast results, and handy to have instead of a book taking up space.

Possible suggestions for future versions: 
* please clarify I-P units (specify psia, for instance, instead of psi)
* it was not immediately obvious how to get to saturation properties (use the p,x or t,x tabs and set quality to 1 for vapor and 0 for liquid), maybe if there was a quick toggle option that would help
* take better advantage of the real estate on the iPad -- less scrolling or f, fg, and g saturation properties in a three-column table
* provide a way to mix units -- e.g., enter units in I-P and get SI results without having to toggle the entry units as well, but this may add needless complexity 
* instead of verbose property descriptions consider the use of standard nomenclature (h instead of enthalpy, s instead of entropy, cp instead of isobaric heat capacity) with a touch to bring up verbose description or an option to switch between the two.

### 1/5 — Something is not workin correctly - dont buy

*2012-06-10*

The application, though promishing, is not working. It constantly puts the number "-1" in one of the input fields and one can not delete it for a logically correct number. Dissapointment, realy, as it must be relatively easy to write programs requiring numerical input.

### 4/5 — Wasser und Dampf entschlüsselt

*2012-04-19*

Alle Werte der IAPWS 97 in einer App immer dabei haben zu können, das ist schon hilfreich.

Für Ingenieure im Betrieb wäre es jedoch super, wenn man auch bar Überdruck eingeben und man Bedingungen entlang der Sattdampfkurve einfach erhalten könnte, durch Eingabe von nur Druck oder Temperatur. Dann gäbe es 5 Sterne

## Frequently asked questions about International Steam Tables

### What is International Steam Tables?

International Steam Tables is a utility app that calculates thermodynamic properties of water and steam based on the IAPWS-IF97 formulation. It is designed for students and engineers to use in their daily work.

### What devices does International Steam Tables support?

International Steam Tables is available for iPhone, iPad, and iPod touch devices. It is compatible with iOS devices.

### How much does International Steam Tables cost?

International Steam Tables is a paid application, priced at $2.99. There are no in-app purchases or subscription fees associated with its use.

### What kind of properties can International Steam Tables calculate?

The app can calculate a wide range of properties including pressure, temperature, vapor fraction, specific volume, density, internal energy, enthalpy, entropy, heat capacity, speed of sound, and more, depending on the input variables provided.

### How frequently is International Steam Tables updated?

The app was last updated on September 22, 2017, to version 1.1. It was initially released on February 28, 2012.

### What is the age rating for International Steam Tables?

International Steam Tables has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

### Does International Steam Tables have ads?

No, International Steam Tables does not contain advertisements. As a paid application, it offers an ad-free experience for its users.

### What is the user sentiment for International Steam Tables?

Based on the available data, International Steam Tables has a rating of 3.9 stars from 8 ratings. This suggests a generally positive reception from its users.

## Version history (last 2 releases)

### 1.1 — 2017-09-22

This update from Apple will improve the functionality of this app. No new features are included.

The "International Steam Tables - IAPWS-IF97" app has been updated for iOS 11 and to support current mobile Apple devices.

### 1.0 — 2012-02-27

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-07.*