Freezing by Boiling Demo – Flinn Scientific

The boiling point of a liquid depends on the external air pressure. When water is placed under vacuum, the boiling point decreases and the water boils. Boiling, however, is an endothermic process—as the water boils, the temperature decreases, and the water soon freezes!

In this demo, pressure changes cause a sample of acetone freezes while still boiling.

Click here for the complete instructions, courtesy of Flinn Scientific 

The Dripper

Hand print

Many children can identify that water exists in 3 states within our natural environment. Understanding that it is the very same water that undergoes changes of state presents far more of a challenge to children in grade 2. The following experiment is simple yet effective in helping children understand changes in state and a rudimentary understanding of the water cycle.

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