People said this experiment was impossible, so we tested it

People said this experiment was impossible, so we tested it

by Veritasium (Derek Muller)

Formal & Physical Sciences Science — General & History PDScience: general issues
🎙 Veritasium (Derek Muller) 👥 21.1M 📅 October 5, 2024 ⏱ 34 min 👁 9.9M 📄 documentary 🧭 2026-08-27
Available in: English (current) Français

Keywords

thermitealuminothermic reactionHans Goldschmidtweldingdata destruction

Summary

This Veritasium video explores the thermite reaction, a highly exothermic chemical process discovered by Hans Goldschmidt in the late 19th century. The host, Derek Muller, visits the Goldschmidt company in Germany, where he collaborates with experts to film the reaction from inside a crucible using a specially designed glass window—an experiment previously deemed impossible. The video covers the history of thermite, its role in producing pure metals for dyes, and its modern applications in welding, demolition, and data destruction. Through high-speed footage and slow-motion shots, viewers see the reaction’s pulsing behavior, which the scientists admit they do not fully understand. The video also demonstrates the safety of thermite by attempting to ignite it with various heat sources, showing that it requires extreme conditions to react. Additionally, a segment shows a thermite tile destroying a laptop to illustrate its use in secure data erasure. The video includes a sponsored segment for Incogni, a data privacy service, and concludes with a discussion of how thermite’s controllability makes it valuable in industrial and military contexts.

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Critical Evaluation

Value of the Information & Strength of the Argument

The video provides substantial value by offering unprecedented visual access to a thermite reaction, which is both scientifically informative and visually striking. The argumentation is solid, grounded in direct collaboration with industry experts and historical documentation. The narrative effectively explains the chemistry behind thermite, its historical significance, and its practical applications. The scientists’ candid admission of not knowing why the reaction pulses adds credibility and highlights the ongoing nature of scientific inquiry. The demonstrations are well-designed to illustrate key points, such as the separation of metal and slag, the control of reaction rate, and the safety of handling thermite.

Scientific Rigor, Source Quality, Title Accuracy

The video demonstrates high scientific rigor by involving experts from the Goldschmidt company, which has a century-long history with thermite. It references historical documents, including Hans Goldschmidt’s original publications, and provides links to peer-reviewed articles and archival materials. The title accurately reflects the content, as the central experiment—filming inside a thermite reaction—was considered impossible and was successfully tested. The video also includes a clear disclaimer about safety precautions and acknowledges uncertainties, such as the unexplained pulsing phenomenon. Overall, the sources are credible and well-integrated into the narrative.

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Title / Content Match

The title accurately reflects the video's core narrative: testing an experiment deemed impossible (filming inside a thermite reaction) and showcasing the results.

Quality & Reliability

9/10

High-quality production with direct collaboration with industry experts (Goldschmidt), clear explanations of chemical principles, and transparent acknowledgment of uncertainties. The video includes archival references and peer-reviewed sources.

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Contribution & Novelties

The video provides a unique, first-ever visual documentation of a thermite reaction from inside the crucible, offering new insights into the reaction dynamics, such as the observed pulsing behavior. It also demystifies common misconceptions about thermite’s explosiveness and demonstrates its controllability. The collaboration with the Goldschmidt company adds historical depth and practical expertise.

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Radar Profile

The radar profile shows high scores across all dimensions, indicating a well-rounded and reliable video. The strong performance in information quantity and quality reflects the depth of content and expert input, while the high technical level and global reliability underscore its scientific credibility.

Reliability 9/10

💬 Très positif. Sur les 30 commentaires analysés, les spectateurs expriment une admiration unanime pour la rigueur scientifique, l'humour et la transparence des experts, avec des éloges répétés pour la phrase « I don't know » comme exemple d'honnêteté intellectuelle.