The Science Behind the Dent
Milk jugs are made using a process called blow molding, where molten plastic is inflated inside a mold. During this process, designers add the dent to help manage internal stress and pressure changes.
- Absorbs expansion: when milk warms up and pressure rises
- Contracts safely: when the jug cools, avoiding vacuum collapse
- Adds rigidity: the curved dome shape reinforces strength
In simple terms, the dent allows the jug to breathe without breaking — a perfect blend of science and practicality.
