Electrified Pickle
Electrified Pickle - Periodic Table of Videos
Introduction
In this video from the "Periodic Table of Videos" series, the presenter demonstrates the classic experiment of electrifying a pickle (or gherkin) to explore the chemical and physical reactions involved. The video emphasizes the scientific principles behind the experiment while also cautioning against attempting it due to the potential dangers.
Main Points
Setup and Safety
- Apparatus: The experiment involves inserting two electrically conductive metal pieces (like forks) into each end of a pickle and applying a high voltage across it.
- Safety Warning: The presenter warns that this experiment is extremely dangerous and should not be attempted at home due to the risk of severe electric shock.
Conducting the Experiment
- Pickling Process: Pickles are preserved in a solution of salt and vinegar, making them electrically conductive due to the presence of sodium and chloride ions.
- Initial Observations: Upon applying the current, nothing happens initially, but soon one end of the pickle begins to glow. This is due to the heating effect at the point of maximum resistance.
Alternating Current and Light Emission
- AC Current: Mains electricity is alternating current, switching from positive to negative at 50 Hz (UK) or 60 Hz (US). This causes the pickle to glow intermittently.
- Sodium Emission: The sodium ions in the pickle emit light, similar to sodium streetlights, as the pickle heats up.
Thermal Imaging and Further Experiments
- Thermal Imaging: Using a thermal-imaging camera, the presenter shows the pickle heating up, with steam visible and the glowing end reaching high temperatures.
- Modifying the Pickle: The team cuts a section out of the pickle to increase resistance at the middle, hypothesizing that it would heat up more at this point. This is confirmed by the thermal imaging showing higher temperatures at the narrowed section.
Additional Observations
- Unpredictable Behavior: The glowing shifts between ends of the pickle in subsequent trials, highlighting the variability of biological specimens.
- Educational Value: The presenter encourages viewers to think about the science behind the demonstration, emphasizing the importance of understanding the underlying chemistry and physics.
Conclusion
The electrified pickle experiment serves as both an entertaining and educational demonstration, illustrating the principles of conductivity, resistance, and ion emission. The video combines practical observations with scientific explanations to enhance viewers' understanding of these concepts.