Beakman smashes a tomato with a mallet. Then puts another tomato in liquid nitrogen to show it was frozen and hits with a mallet. He then takes a blown up balloon and puts it in a bowl. He pours liquid nitrogen over it and shows the balloon shrinking. He explains this happens because everything is made of molecules. Then he uses a cartoon schematic to explain further. He also shows that when the balloon gets warmer, the air starts to expand and fills back up the balloon.
Beakman demonstrates force and pressure with a balloon sitting on one nail with a brick on it (it pops) and then how it doesn't pop if you have more nails to distribute the pressure of the force. He shows how this also applies to cutting a tomato. Then Beakman lays on a bed of nails to prove it.