Your cart is empty.
Your cart is empty.The Ball and Ring allows for a visible demonstration of the principles of the expansion of metals. When the ball is heated it will not pass through the ring, but when cooled the ball passes through the ring freely. The Ball and Ring are mounted on insulated plastic handles to protect your hands from the heat. Instructions included.
Jonnie L.
Reviewed in the United States on December 25, 2020
The product works well but the ring at the base of the rod came loose. This is just cosmetic.
Customer
Reviewed in the United States on January 5, 2020
They look so beat up. Like someone has already been using them for years. And it didn't work. I heat up the ball for about 5 minutes and put the ring in ice cold water for 5 minutes and it passed through every time. The handles are made of wood, not plastic like the description says.
Chena
Reviewed in the United States on November 5, 2019
Perfect for the science experiment. Ordered and arrived on time. Países process.
Customer
Reviewed in the United States on September 17, 2017
This item needs to publish spec to ensure that purchasers know that it contains lead, making classroom use problematic.
Elisabeth McCormack
Reviewed in the United States on June 3, 2017
Nice replacement for a set I ruined by shocking them cold in water. They need to cool down slowly or they won't fit anymore. Cheaper than catalog companies
Recommended Products
$44.99
$ 23 .99 $23.99