The temperature of molten copper is 1,984 degrees Fahrenheit.
Wouldn’t it burn through anything?
YouTube user Tito4re filmed himself pouring liquid copper over a Big Mac, and the McDonald’s sandwich doesn’t go down without a fight.
The bun catches fire and chars slightly, but seems initially unharmed. The meat patty looks like it’s actually resisting the copper: The molten metal slides off without harming the patty before the entire burger catches fire.
This may seem like a testament to the toxicity of fast food, but there’s a perfectly logical scientific explanation for this phenomenon called the Leidenfrost effect. The Leidenfrost effect occurs when a liquid comes in near contact with a solid significantly hotter than its boiling point; the surface of the liquid comes to a nearly immediate boil, creating a thin layer of protective steam. It’s the same effect seen when you drop water onto a hot pan and the droplet dance across the surface. In this case, moisture in the burger protects the burger for a few moments before the copper burns it.
So, not to worry: If you love your Big Macs and can’t bear to part with them, the fact that you can pour molten copper over them is not an indictment – it’s just a cool trick.