The molecules and atoms vibrate at higher temperatures and begin to push apart from each other. This phenomenon is known as thermal expansion. Simply heat the brass ball for two minutes. This will cause the ball to expand; hence it will not fit through the ring. When the ball cools down, it will once again fit smoothly through the ring. Great for the classroom or the home laboratory!
Watch this laser pointer emit a cool purple beam!
This advanced physics kit is perfect for older children already versed in physics knowledge!
The Ball of Whacks is the perfect creativity tool for innovators, artists, engineers, writers, students, and you!
See the solar system in action!
The Hoberman Sphere expands and contracts with a magical motion so fluid and simple that kids can't help but play with it for hours.
Build a model car that runs on hydrogen gas using a unique reversible fuel cell!