Why are cold drink plastic bottles flat from bottom? The reason will surprise you

We all love our fizzy soda drinks that satisfy our thirst, and they are undoubtedly among the most popular beverages in the world. These delightful soda drinks are a staple at parties, and kids adore them. The history of cold drinks can be traced back to the 17th century. The first lemonade—lemon juice, water, and honey—was the earliest marketed soft drink. In 1676, the Compagnie de Limonadiers in Paris was granted a monopoly to sell lemonade. Europeans attempted to imitate the naturally carbonated waters of springs in the 17th century. Johann Jacob Schweppe developed a process to manually carbonate water in Geneva in 1780.

The development of bottled soft drinks was a marvellous idea, making them a common sight in shops and households. Bottled soft drinks fall under non-alcoholic beverages and contain acids, flavours, colours, water, non-nutritive sweeteners, emulsifiers, preservatives, and other compounds.

Why cold drink plastic bottles flat from the bottom?

The introduction of plastic bottles or commonly knowns as PET bottles (polyethylene terephthalate) made the sweetened soda beverage more convenient for people to carry or store it in their refrigerator. But have you ever imagined why these soft drink bottles are not flat from bottom and why their shape is different from normal packaged drinking water? Don’t worry we have the answer which definitely surprise you.

Well, the answer is cold drink plastic bottles are not flat at the bottom because of the presence of bumps. However, the design of these pet bottles is not just for aesthetics; rather it has a scientific purpose related to the gas inside the soda.

• Soft drink bottles need a special design because of the volume changes that occur when the drink is chilled.
• The base of the bottle is designed in a way to adjust according to the drink’s volume. It also helps control the pressure caused by the gas.
• This specific type of bottle design is called “corrugation.”
• It is worth noting that, the carbonation in the soft drinks creates pressure at the bottom of the bottle and this is the reason why the base is made tighter and stronger than the top portion. It also allows the bottle to withstand the pressure.