Video in which a disposable plastic cup with water does not melt when placed on fire goes viral; understand why this happens

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Internet users were full of doubt and even theorized to find out why the glass remained intact. g1 spoke to a physics professor to understand the ‘mystery’. It’s natural to think that if we put a disposable plastic cup filled with water directly on the fire, it will melt. But, contrary to what is expected, this does not happen! On the internet, a video showing this experience went viral, and internet users, amazed by the result, thought of several theories to try to explain this “mystery”: “Fire isn’t even crazy enough to melt a glass of water, because otherwise the water puts out the flame. It’s that simple. It’s called ‘understanding your limits'”, joked a user on X (formerly Twitter). ❌ Although fun, this idea, of course, is not true. 📽️ SEE THE EXPLANATION IN THE VIDEO BELOW: Why doesn’t a plastic cup full of water melt in the fire? ✔️ “Fire passes heat to the plastic that is in contact with water. When the plastic receives this heat, it passes [o calor] to the water. Even so, the water does not heat up enough to make the glass melt”, explains Enio Kaufmann, physics professor at the Unified School of Porto Alegre (RS). This is due to the specific heat of the water — which is the amount of heat necessary to that a substance undergoes a change in temperature — in addition to the temperature required to melt the glass. Consider the following: Water boils at 100ºC The glass starts to melt at 107ºC Fire burns at around 300ºC Despite the If the fire is hot enough to melt the glass, the water is cold enough to prevent the plastic from melting. In other words, the glass would only melt after the water had completely evaporated, and the glass would no longer have anywhere to transmit the heat from the fire. . EDUCATION VIDEOS

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