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Bubble gum

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Bubble gum is a specific variety of chewing gum designed for inflation. Its primary purpose is to be blown out of the mouth as a bubble.

Bubble gum at the Haribo factory
Bubble gum at the Haribo factory

This unique function requires special physical properties. While regular gum is made for chewing, bubble gum is engineered for stretching. This allows it to form and maintain large, stable bubbles. It can withstand significant stress from the tongue without breaking apart. This ability makes it a popular treat for children and hobbyists alike.

To understand how bubble gum works, we must look at its mechanical properties. It consists of long-chain polysaccharides, which are complex sugar molecules. These molecules allow the gum to show viscoelastic behaviors. This means the gum acts both like a liquid and like a solid. When you chew, the gum reacts to shear rate, shear strain, and shear stress. These are terms for how the gum deforms under the pressure of your teeth. Scientists study these rheological properties to improve how gum feels and chews.

Bubble gum at the Haribo factory
Bubble gum at the Haribo factory

Scientists categorize these movements into different stages. One stage is the linear viscoelastic (LVE) property. This is measured using small amounts of pressure called small amplitude oscillatory shear (SAOS). Under very low stress, the gum shows elastic deformation. This means it behaves like a critical gel. However, if the stress passes a certain point, it enters a nonlinear response called plasticity. This happens when the stress exceeds the critical yield strain. In most gums, this yield strain is less than 1%.

Bubble gum at the Haribo factory
Bubble gum at the Haribo factory

Another important part of the gum's behavior is fractional recovery. This is the ability of the gum to return to its original shape after being stretched. For normal chewing gum, the recovery rate is between 25% and 40%. This high recovery provides a satisfying sensory feel. In contrast, bubble gum has a much lower fractional recovery of less than 15%. This lower recovery is actually a sign of its strength. It allows the gum to handle the high stress needed to blow a large bubble.

Bubble gum at the Haribo factory
Bubble gum at the Haribo factory

The history of bubble gum began in 1928 in Philadelphia. Walter Diemer was an accountant for the Fleer Chewing Gum Company. He was experimenting with various new recipes. He found a formula based on a gum called "Blibber-Blubber." This new recipe was less sticky and stretched more easily than regular gum. The president of Fleer named the product Dubble Bubble because of this texture.

Bubble gum at the Haribo factory
Bubble gum at the Haribo factory

Interestingly, the famous pink color was an accident. Diemer's recipe originally looked a dingy gray. He only had red dye on hand, so he added it to fix the color. This created the iconic pink shade we see today.

As time passed, the composition of bubble gum changed significantly. Early gum often used natural rubber called chicle. If chicle is used, it must pass strict purity and cleanliness tests. However, most modern gum uses synthetic gum-based materials. These man-made bases allow for longer-lasting flavors and softer textures. They also reduce tackiness, which means the gum is less sticky. In the 1970s, brands like Hubba Bubba and Bubble Yum introduced these synthetic bases. This helped prevent the gum from sticking to faces when a bubble popped.

Flavoring is another complex part of the bubble gum experience. While there is a general "bubble gum" flavor, it varies by company. Many companies use artificial esters to create taste. These include chemicals like methyl salicylate, ethyl butyrate, and benzyl acetate. A natural version can be made by mixing banana, pineapple, cinnamon, cloves, and wintergreen. Children often prefer simple flavors like strawberry or blue raspberry. They tend to reject complex flavors because they feel like they want to swallow the gum instead of chewing it.

Bubble gum at the Haribo factory
Bubble gum at the Haribo factory

Bubble gum has even become part of popular culture and world records. In 1994, Susan Montgomery Williams set a Guinness World Record for the largest bubble. Later, on April 24, 2004, Chad Fell achieved the record for the largest hands-free bubble. Some cities even have tourist attractions dedicated to used gum. Bubblegum Alley in San Luis Obispo, California, features gum on its walls. Similarly, the Market Theater Gum Wall in Seattle has a brick wall covered in used gum. These sites show how much people interact with this unique substance.

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