What Everything Is Made Of
Four parts working down to the particle level. See how the same particles arranged three ways produce solid, liquid and gas, then watch energy move a substance between those arrangements, find out why the temperature stops rising while it does, and finish with the process that only looks like melting.
CodePLU Goal
Upgrading Human Mental Models
Learn how to think in Workflows
What Are the Three States of Matter?
Solid, liquid and gas are not three kinds of stuff — they are three arrangements of the same particles. Learn what each arrangement does, in an interactive playground.
What Happens to Particles When Ice Melts?
Every change of state is energy going in or coming out, and every one can be reversed. Learn what the particles do at each step.
Why Doesn't Ice Water Get Warmer While It Melts?
Heat a glass of ice water and the temperature refuses to budge until every last piece has melted. Learn where that energy goes, in an interactive playground.
How Do You Get the Salt Back Out of Salt Water?
Dissolved salt looks gone but is still entirely there. Learn why dissolving is not melting, and recover the salt step by step.