Скачать или смотреть Water Absorbs Heat

Plastic melts at relatively low temperatures, but water has a high specific heat capacity. It can absorb a lot of heat with only a small rise in temperature. As the flame heats the plastic, thermal energy is rapidly transferred into the water inside, keeping the plastic cool enough to resist melting or burning. This happens because heat conducts through the thin plastic layer into the water, which acts like a thermal reservoir. As long as the water doesn’t boil away, it keeps the plastic’s temperature below its melting point. It’s the same reason you can boil water in a paper cup over an open flame without the paper catching fire. As long as there’s water inside, the cup stays cool enough.

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