By Mobile Science Apps
Open iTunes to buy and download apps.
MolSim performs "molecular simulation" in real type on your iPhone/iPad/iPod.
MolSim shows you how molecules interact and let you control their number and their temperature.
You can see them become a gas, a liquid, a glass, a crystal, or many of the above! It's a great tool to learn the different states of matter.
What's New in Version 1.3
You can now tag molecules (tap on them) and follow their progress while they diffuse away.
I wish the temperature bar was more sensitive