# Gas Compressibility Factor Z — Z-Factor of natural gas

> Z-Factor of natural gas (iPhone/iPad app by Carlos Moura.)

- Source: https://appshunter.io/ios/app/gas-compressibility-factor-z/id1626924678 (this page in markdown: same URL + `.md`)
- Developer: [Carlos Moura](https://appshunter.io/developer/407501202)
- Category: Utilities, Education
- Price: Free
- Age rating: 4+
- Requires: iOS 13.0 · 3 MB
- Languages: American English
- Released: 2022-05-31
- Data updated: 2026-09-02
- User reviews in markdown: https://appshunter.io/ios/app/gas-compressibility-factor-z/id1626924678/reviews.md

## What is Gas Compressibility Factor Z?

This app is a tool very useful for complex calculations of the gas compressibility factor Z for natural gases used in the Gas Law: PV = nRTZ. Formulas by Hall and Yarborough (1973) correlation to estimate z-factor of natural gas.

Standing and Katz’s Chart to Z-Factor vs Reduced Pressure and Reduced Temperature was plotted by app using formulas by Hall and Yarborough (1973).

Check for oil & gas applications in our portfolio on the App Store. Please visite our website for links at www.wellcontrol.com.br

Please, you can contribute for improvements. Report bugs and suggestions to contact@wellcontrol.com.br

DISCLAIMER:

These tools & materials are provided 'as is' without warranties of any kind, express or implied.
Please verify the tools provided by this application by yourself before you use them. Ensure you understand the impact of using these tools.
Any use you choose to make of these tools & materials is undertaken by you entirely at you own risk.


## Version history (last 3 releases)

### 2.1 — 2023-08-27

- improved iPad 11 version  to run on Mac M series (designed for Mac)

new features based on user requests:
- current pseudo-reduced temperature highlighted in the Z-factor graph
- on moving your finger on the graph shows the Z factor versus the gas pressures for the current gas temperature
- added options to select units and set decimals

### 2.0 — 2023-08-24

- new design with z-factor chart plotted by app using formulas by Hall and Yarborough (1973)
- updated icon with chart plotted by app

### 1.0 — 2022-05-31

No release notes.

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## More apps by Carlos Moura

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All apps by Carlos Moura: https://appshunter.io/developer/407501202

## Related topics

[compressible gas flow calc](https://appshunter.io/ios/topics/compressible-gas-flow-calc)

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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 2026-09-02.*