Equipment:

• Brass cylinder
• Electric drill
• wooden clamp
• water

Demo:

A brass cylinder with a small amount of water sealed in by a rubber cork is quickly rotated by an electric drill. When the cylinder is squeezed by the wooden clamp (see the picture) the applying friction heats the water. In 1 to 2 minutes the water starts boiling and shoots the cork out of the tube.

Explanation:

This is an effect of temperature and Thermal expansion. As the tube heats up the water turns into a gas and then its new volume is based on its coefficient of volume expansion. The greater the volume of gas gets the more pressure builds up until the weakest part of the chamber (cork) gives out.