When glass melts, the solid structure breaks down and the glass becomes a viscous liquid. The molecules rearrange and flow freely, allowing the glass to take the shape of its container. As it cools, the glass solidifies back into its rigid form.
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Intense heat from sources like a blowtorch or a high-powered laser can cause glass to melt.
When a piece of glass is exposed to intense heat, it undergoes thermal expansion which can cause it to crack or shatter. The heat can also cause the glass to soften and deform. If the temperature is extreme enough, the glass can even melt.
Rubber does not melt because it is a polymer that decomposes when exposed to high temperatures. Glass does not have a definite melting point, but rather softens and gradually becomes more fluid as temperature increases. At extremely high temperatures, glass will eventually flow like a liquid.
The ice does not melt in the glass because the boiling water does not directly contact it. The temperature difference between the hot water and the ice is not significant enough to transfer heat efficiently through the glass to melt the ice.
Plastic and glass are better conductors of heat compared to ice, so when ice cubes are placed on them, heat from the surroundings is transferred to the ice, causing it to melt. The higher rate of heat transfer in plastic and glass materials speeds up the melting process of the ice cubes.