iPad Screenshots


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

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.

Ratings and Reviews

2.8 out of 5
21 Ratings

21 Ratings

teacherByTrade ,

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.

jsmiley4 ,


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.

ProvidenceHS ,

Found a bug

There is a bug in the Charles' Law section. If you decrease temperature with two taps, subsequent single tap temperature increases uses the blue cooling animation instead of the red warming animation.

App Privacy

The developer, T. J. Fletcher, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


Tj Fletcher
3.4 MB

Requires iOS 3.2 or later. Compatible with iPad.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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