How to make foam

Make sure you have goggles on

You're going to need two small beakers for your polyurethane A and B, and the craft stick in the cup

Once you get your polyurethane put in the cup

Polyurethane A

Polyurethane B

Mix it together to get a chemical reaction. At the same time the sides of the cup should get hotter but do not touch the foam till it is cold. This is also an exothermic reaction.

After you are done here's the outcome.

Law of conservation of mass is also part of this lab. It is because no matter what you do to it, it will still be the same mass.