Pickle Glows with 100+ Experiments

A pickle will glow when mounted on two metal forks and plugged into a socket, a classic K-12 science demonstration that has long remained a mystery. Josh Méndez, an assistant professor of electrical engineering at Portland State University, investigated the physics behind the glowing pickle, conducting over 100 experiments with burned pickles to approach an answer.

The glow is caused by a hybrid of spark discharge and chemical ignition via electrolysis. Pickles conduct electricity because they are soaked in salty brine, allowing the electrical spark to ignite hydrogen gas and produce a characteristic orange glow due to excited sodium ions.

Méndez's research indicates that the electrical spark ignites hydrogen gas, producing the glow. The characteristic orange glow is due to excited sodium ions. The glow only occurs on one end of the pickle, which may be explained by the production of hydrogen ions at the negative electrode.

## Why it matters The glowing pickle phenomenon is not just a quirky science experiment, but also a demonstration of the complex interactions between electricity, chemistry, and physics. Understanding the physics behind the glowing pickle can provide insights into the behavior of electrical systems and the properties of materials. The research also highlights the importance of curiosity-driven science and the value of exploring seemingly obscure phenomena.

The glowing pickle has been a staple of K-12 science demonstrations, but its underlying physics had remained unclear. Méndez's research provides a new understanding of this phenomenon, shedding light on the complex processes that occur when a pickle is subjected to an electrical current. As a result, the glowing pickle can continue to inspire and educate students, while also contributing to our broader understanding of the natural world.