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Gas Laws HD Lite

By T. J. Fletcher

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Beginning chemistry students can use this app to study the various relationships that exist between pressure, volume, temperature and number of particles of a gas.

Now available:
* Boyle's Law - the relationship between pressure and volume.

Drag the plunger back and forth to change the volume of the gas. Observe and record the change in pressure. Graph pressure (P) versus volume (V). Determine the relationship. Press the MODE button on the digital meter to switch between atmospheres (atm), kiloPascals (kPa), and millimeters of mercury (mmHg).

* Charles's Law - the relationship between volume and temperature.

Use the red and blue buttons to set the target temperature. Observe and record the volume at various temperatures. Plot a graph of volume (V) versus temperature (T). Determine the relationship. Switch between common temperature units.

Next up:
* Graham's Law - the relationship between the molar mass of a gas and the rate at which it will effuse.

What's New in Version 2.1

The final position of the piston following a temperature change in the Charles's Law simulation was incorrect. The position was updated to reflect the expected value. Thanks to Jeff G for pointing this out.

Also fixed an incorrect offset value which resulted in a white bar at the bottom of the menu screen.

iPad Screenshots

iPad Screenshot 1
iPad Screenshot 2
iPad Screenshot 3

Customer Reviews

Worked For My Students

To V1@enterprise...why don't you try contacting the developer with your concerns? I've used this in my classes with my students, and we've had no problems. The developer is a former chemistry teacher and friend of mine, so I'm not sure about your claim of inaccuracy. If you are truly unhappy with the app, you can always request a refund. ;) Better yet, contact the developer (he's a decent guy) with your concern and see if you can't help improve the app. I'm still waiting on the Graham's Law, but I know he's been busy.


The would speed up the lab series I typically use where students do Boyle, Gay-Lussac, & Avogadro gas laws over a three class periods of block scheduling. I'll likely use app to add Charles' law to the series. Thanks. I bet you'd like to see particle movement like me when a change is made to one of the independent variables so this is my only recommendation. The students would graph on logger-pro as the data rolls in.

Very inaccurate

Both modes, Boyle's law and Charles' law, are so inaccurate and hard to use that they are practically useless for actual Chemistry class. Plunger only goes up to 600 mL and only if you 'fight' with it. Temp scale cannot be set on a specific temperature. Although the instructions lead me to believe that graphing was part of this app, it is not. All in all, this is a useless program for actually learning Chemistry principals. There are much better options on the computer that are also free.

Gas Laws HD Lite
View in iTunes
  • Free
  • Category: Education
  • Updated:
  • Version: 2.1
  • Size: 3.4 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 3.2 or later. Compatible with iPad.

Customer Ratings

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