Let's ice with salt!
It's easy to play.
First, you should have a thermometer and a lot of ice.
Measure the temperature when the cooling starts.
After about ten minutes later, the temperature may be stable.
Let's pour three spoons of salt in the ice!
You can observe that the temperature cools more.
The temperature falls to -19 degree.
Let's observe the following graph.
You and your kids can understand that Salt is fantastic catalyst.
Hope you and your kids enjoy the exam.
