Change of state in an explosive way! Classes Used: PHYS 153

Change of state

To demonstrate change of state

Cast iron bombs Water Liquid nitrogen Gloves Pliers Thread tape Water jug Blast Shield (See Blast Shield in catalog for more details)

Apply thread tape to threads on the cast iron bomb cap Fill the ice bomb full of water and securely screw the lid shut with the pliers. To insure that there is no air inside of the ice bomb fill a bucket of water and tighten the bomb while it is submerged Try to get all the air out Cut the top off a 2L pop bottle so it creates a container for the liquid nitrogen (make it as tall as possible) Place bomb inside the container and add liquid nitrogen until the container is full (more is better so as to make sure the bomb explodes) Place the protective cover over the apparatus and wait for the BOOM!

This is a dangerous demonstration Please keep it a distance away from the students and ask for assistance from demo staff

Updated on: 06/19/13