Why Do Cars Have Rear Window Defroster Lines?

By Simple Things - Surprising Histories

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Rear window defrosters are an everyday automotive feature that plays a critical role in winter driving safety. In this video, we explain how these defroster lines work and how they are made using real science and verified engineering methods. Rear Window Defrosters Explained: How They Work and Why They Are Made of Paint | Simple Things Surprising Histories This documentary style episode from Simple Things Surprising Histories covers the complete history and science of rear window defrosters, from their 1950s invention to how they use physics to melt ice instantly. Topics covered in this video: • What rear window defrosters are and why they were invented • The dangerous winter driving problem of the 1940s and 1950s • Heinz Kunert and the invention of the heated rear window • How defroster lines are made using conductive silver paste • How electrical current and Joule heating melt ice on glass • The science of parallel circuits in automotive engineering • Why scratching a defroster li

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