Editing Tyndall's Bar Breaker (section)

== Demonstration ==

# Set up the stand and put the U-bar in the clamp holder. Put an iron ingot through the three holes in the U-bar, and tighten the nut on the rod as much as you can.
# Put on the safety gear and start heating the middle of the rod with the blow torch. As you heat it, continue to tighten the nut as you are able. Be sure to keep the blowtorch on one spot, and heat it until it starts to glow red. Once it is, make sure the nut is as tight as you can make it before turning off the blowtorch.
# Put the small blast shield in front of the setup, and switch over to a second demonstration. In 5-10 minutes, there will be a loud "PING!", and the iron ingot will be broken! Show the audience the broken ingot and ask them why it broke. What caused it to break?