Implosion

Implosion is a process in which objects are destroyed by collapsing or being squeezed in. The opposite of explosion, implosion concentrates matter and energy and usually involves a difference between internal and external pressure.

During the heating of the water inside the can, the water temperature arises to 100 oC, being the volume of the can completely filled by water in liquid state in equilibrium with its vapour. When the can is turned 180o, the water vapour is kept inside it and the liquid passes to the hole. When diving the inverted can in the plate water (about 20 oC), it will cause an abrupt change in the temperature. The vapour inside the can will be suddenly cooled and condenses immediately and the can will shrink until a new equilibrium state is reached.