Nitrogen Dog

A dog constructed out of a modelling balloon is slowly submerged in a liquid nitrogen container. When the presenter pulls it out a few seconds later, nothing more remains of the dog except a small, tightly compacted balloon ball. However after a short while the dog slowly comes back to life. He inflates himself back to his original form, though he still has a cold nose….

How does it work?
Liquid nitrogen has a temperature of minus 196 degrees Celsius. When a balloon is submerged in it, the air particles in the balloon are all pulled closely together and its volume rapidly decreases. Moreover the air itself becomes liquid at around minus 192 degrees Celsius, so a part of the air in the balloon is in fact liquid. The air pressure of normal room temperature compresses the balloon almost completely. However as the balloon warms up the air inside expands again to its original size.