# Steam Pad

> Calculates water and steam thermodynamic properties with interactive charts. (iPhone/iPad app by 晓东 翟.)

- Source: https://appshunter.io/ios/app/steam-pad/id1450611272 (this page in markdown: same URL + `.md`)
- Developer: [晓东 翟](https://appshunter.io/developer/1450611271)
- Category: Utilities, Education
- Price: Free with in-app purchases
- Rating: 3.70/5 from 3 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 5 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2019-02-05
- Data updated: 2026-06-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/steam-pad/id1450611272/reviews.md

## What is Steam Pad?

1.	Introduction
Steam Pad calculates the thermodynamic and transport properties of water and steam, using the latest releases of IAPWS. It has some distinctive features, and is applicable for industrial, engineering, and teaching processes: 
− Uses any selected 2 basic parameters to calculate others.
− Provides T-S, H-S, P-H, T-H charts, and locates results (point locations) on them.
− Computes additional thermodynamic and transport parameters.
− Allows saving the results, and supports restoring one of them.

2.	Calculator
2.1 Inputs and outputs
By given any selected 2 parameters as the inputs from the Basics (Pressure, Temperature, Enthalpy, Entropy, Specific volume, Vapour Fraction), this App calculates other 4 parameters, and calculates some other thermodynamic and transport parameters. The inputs and outputs of the basics can alternate, which fulfills alterable calculating demands. 
2.2 The range of validity
The range of validity defined by pressure and temperature for general properties is the same to the definition in the release of IAPWS IF97.
2.3 Single-Phase regions and Two-Phase region
The calculating demands are handled coordinately both for the Single-Phase regions and the Two-Phase region. The calculated properties and the corresponding region of the results can be distinguished from inputs automatically, and will be displayed in the outputs list box. For example, the saturation properties can be derived from the given P (less than 22.06395Mpa) and X (0.0-1.0).
2.4 Other properties
The optional parameters are calculated based on the releases of IAPWS, or on the physical models, which include:
− u: Specific internal energy
− Specific isobaric heat capacity
− Specific isochoric heat capacity
− Speed of sound
− Dynamic viscosity
− Kinematic viscosity
− Thermal conductivity
− Entropy index
− Static Dielectric Constant
− Prandtl number
2.5 Units
The parameters are shown in SI(metric) or in I-P(English) system of units, which can be reset in the Outputs Setting function of the app.

3. Charts
3.1 Chart types
Typical thermodynamic charts are embedded in this app, and displayed as vector-graphs. Only regions 1 to 4 are shown in the charts, and region 5 is ignored for the applicative concern. The gradual changes (the lines) of the other 4 parameters along with the X and Y ordinates, are shown in the charts. 
There are 4 charts available:
− T-S Chart
− H-S Chart
− P-H Chart
− T-H Chart
3.2 Charts display
− The lines of other 4 parameters are displayed in different colors.
− Lines are displayed or hidden by checking the checkboxes.
− The charts can be moved, enlarged or contracted by dragging or pinching gestures of fingers.
− The corresponding values are attached along with the lines at certain intervals.
− The boundary of the saturation region, and the critical point, are especially identified.
3.3 Calculated results
The calculated results will be located in the charts as an identifying point (or points) with the corresponding ordinates.

4. Results
The calculated records, each of which contains 6 basic parameters, can be stored in a row in the list of the Results panel by clicking the Save button on the Calculator panel. 
− The 2 inputs of one record are displayed in a distinctive color.
− The region of each result, as well as the possible arrangement number of multiple outputs, is shown on the top of the row.
− The records can be re-arranged and be deleted.
− The selected record can be restored both on the Calculator panel and on the Charts panel, by clicking the Restore button.

## Key features

- Calculate properties from any two basic parameters
- Generate T-S, H-S, P-H, T-H charts
- Compute additional thermodynamic and transport parameters
- Save and restore calculation results
- Supports SI and I-P unit systems
- Interactive chart manipulation (pan, zoom)

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full Functions | $3.99 | one-time |


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/steam-pad/id1450611272/reviews.md

### 1/5 — Not useful

*2020-01-17, version 1.0.4*

I am a student and this app was not useful forme as it is for other users in comments. App does not let you to do any calculations in free version and forces you to go premium. Unfortunately almost nothing changes when you go premium.

### 5/5 — Well done app

*2019-09-04, version 1.0.3*

I am teaching undergraduate engineering thermodynamics at Harvard. Among the apps I have tried, this one stands out. Very easy to use. How about adding internal energy to the list of properties?  How about adding Tv plane?

### 5/5 — Excellent for steam properties using the latest IAPWS formulations

*2019-08-28, version 1.0.3*

I am a professional engineer of 53 years standing. I found this app to be intuitive, accurate, and reliable.  Very reasonable price.  Highly recommended.

## Frequently asked questions about Steam Pad

### What are the basic parameters I can use to calculate steam properties in Steam Pad?

Steam Pad allows you to input any two of the following basic parameters: Pressure, Temperature, Enthalpy, Entropy, Specific volume, and Vapour Fraction to calculate the rest.

### Does Steam Pad support different unit systems?

Yes, Steam Pad supports both SI (metric) and I-P (English) systems of units. You can reset these in the Outputs Setting function.

### Can I visualize the calculated results in Steam Pad?

Yes, Steam Pad provides T-S, H-S, P-H, and T-H charts where your calculated results are displayed as identifying points.

### How often is Steam Pad updated?

The latest version of Steam Pad is 1.0.4, which was last updated on January 14, 2020. This indicates a less frequent update cycle.

### What is the age rating for Steam Pad?

Steam Pad has an age rating of 4+, making it suitable for a wide range of users including younger learners.

### What devices is Steam Pad available on?

Steam Pad is available for iPhone and iPod devices.

### Does Steam Pad have ads?

No, Steam Pad does not contain advertisements.

### What is the user sentiment for Steam Pad based on its rating?

Steam Pad has a rating of 3.7 stars from 3 ratings, suggesting a mixed to positive user reception.

## Version history (last 5 releases)

### 1.0.4 — 2020-01-14

Steam Pad calculates the thermodynamic and transport properties of water and steam using the latest releases of IAPWS. 
•Uses any 2 selected general properties to calculate the others. The general properties are P(Pressure), T(Temperature), V(Specific Volume), H(Enthalpy), S(Entropy) and X(Vapor Fraction).   
•Provides typical thermodynamic charts (or diagrams, like Enthalpy-Entropy chart) and locates calculated results (point locations) on them. 
•Computes some other thermodynamic and transport properties. 
•Allows saving calculated results, and supports restoring some of them.

### 1.0.3 — 2019-02-25

Steam Pad calculates the thermodynamic and transport properties of water and steam, provides enthalpy-entropy and other charts, using IF97 and related releases of IAPWS.

### 1.0.2 — 2019-02-12

Steam Pad calculates the thermodynamic and transport properties of water and steam, provides enthalpy-entropy and other charts, using IF97 and related releases of IAPWS.

### 1.0.1 — 2019-02-09

Steam Pad calculates the thermodynamic and transport properties of water and steam, provides enthalpy-entropy and other charts, using IF97 and related releases of IAPWS.

### 1.0 — 2019-02-05

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 2026-06-01.*