Milk bottle (Explode/Implode)

Today we made a milk bottle implode and explode

 1. This is the empty milk bottle.  

The forces acting on the bottle are equal and the bottle is a normal shape.                                                                                              

2. This is the milk bottle filled to the top with hot water.

The force acting on the bottle in the inside is greater than 

the force acting on the outside of the bottle causing it to bulge.

3. This is the milk bottle when the hot water has been emptied and  the bottle has been cooled down under cold water and has collapsed caused by a force acting on the outside of the bottle that is greater than the force acting on the inside of the  bottle.