Here’s an easy experiment: Take ice straight from the freezer and drop it in a glass of water. Listen and watch for the crack. Why does it do that?
Professor Martyn Poliakoff of the Periodic Table of Videos team explains differential expansion. He then gives the experiment a twist: What if “hot” ice is dropped into -196C (-320.8F) liquid nitrogen? What will happen and why?
In the archives: dropping hot charcoal into liquid oxygen in slowmo.
via Viral Viral Videos.