iPad Screenshots


Discover the fundamental nature of matter; everything is made of atoms. The atomic theory is brought to life in "Atoms in Motion" -- a fully interactive atomistic simulation that uses sophisticated Molecular Dynamics (MD) algorithms to perform computational chemistry calculations right on your iPad. Such computations reveal the motions of atoms as they attract, repel, and collide with one another.

Fun for all ages -- in this simulation you control the atoms! With the tap of the finger you can add, delete, or highlight atoms within the simulation. With a gentle touch you can move, place, or throw atoms. With the swipe of a finger you can control the temperature and explore the states-of-matter (solids, liquids, and gases). Discover the physics behind the ideal gas laws, and perform your own experiments by changing the volume, the number of atoms in the simulation, or the temperature.

This Molecular Dynamics (MD) simulation includes realistic interatomic potentials of four noble gas elements: Helium, Neon, Argon, and Krypton (the van der Waals forces are computed using a Lennard-Jones 6-12 potential). The MD simulation continuously computes the pressure, and dynamically plots the pressure versus temperature, volume, or the number of atoms. Users can vary the temperature from near absolute zero to over 500K, and add up to 1,000 atoms to the simulation.

Enjoy the Atoms!

What’s New

Version 3.0

Updated for iOS 11

Ratings and Reviews

4.2 out of 5
10 Ratings

10 Ratings

MaterialsScientist ,

An atomic microscope

This is a truly brilliant app...who would have thought that molecular dynamics simulations, even in two dimensions, could run so well on the iPad?

As a teaching tool, one can learn a lot about the relationship between temperature, pressure, and atomic motion through this app. As a toy, it's tremendous fun just to play god by pushing atoms around and watching how they interact. I highly recommend this app to anyone who has even a passing interest in chemistry, solid-state physics, or materials science.

A few minor quibbles: The UI for controlling temperature is a little dicey; it's easy to accidentally change the temperature when trying to move an atom, and it's very hard to change the temperature if the screen is nearly full of atoms.

Second, it would be nice to have the ability to run a simulation with periodic boundaries (think old-style video games where you go off the side of the screen and come back on the opposite side) instead of a rigid box.

Finally, it would be great to have a way to move groups of atoms together....this could be used to simulate indentation of a material by a round or sharp tip.

But all of these are just suggestions for ways to make this app even more fun. As it stands, it's already excellent and well worth the small investment.

Triboman72 ,

Great for kids, too

With a PhD in physics, I immediately appreciated the value of 'Atoms' as a tool for understanding energy and motion. I was surprised how my grandkids, from 5 and up, enjoyed playing with the screen, making more and more balls collide, raising the temperature and watching the chaos. There ability to control numbers and temperatures also made the 'game' an effective teaching tool (I believe). They saw relations between speed and size, speed and temperature, and even saw that the 'inert' atoms can bond at lowest temperatures. Terrific teaching tool and fun for kids.

Safecracker’s Aficionado ,

The Ideal Chemistry App!

Having spent an academic lifetime thinking about the motion of atoms, I adore the ability to effortlessly setup and interact with truly stable atomistic simulations. This is the best app for chemistry. I use it in the classroom for about 1/3 of my chemistry lectures, and I am actively thinking about how I can use it in all of my lectures. This is exactly what I hoping to see developed for the iPad.

I started to use it to teach simple concepts like the ideal gas laws and kinetic molecular theory, but now I use it to discuss energy, temperature, the states of matter, and interatomic potentials. Together, with the developers other simulation app (Salts), I find them to be a wonderful addition to the classroom lectures. This update includes the much-needed ability to save and name states, so you can plug the iPad into the projector, pop up a simulation, and go. It’s perfect! One of the things that I have found extremely effective is to pose a hypothesis to the class and then ask them to try and create an experiment that test the hypothesis using Molecular-Dynamics. The students are really enthusiastic about using the iPad and the app as part of their homework.

In addition to teaching college courses, this app has become my “go to” demonstration for chemistry. I have taken the app to our department open house and discussed our curriculum with parents, and I have taken the app to a local kindergarten classeto talk about atoms and temperature! I can’t say enough about how much I appreciate all of the effort that the developers have clearly put into this program; it is wonderful! As the other reviewers have so frequently mentioned – thank you and congratulations to the developers, very well done!


Atoms In Motion LLC
11.1 MB

Requires iOS 9.0 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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