if we give heat to glass it starts to cracking and then after It Breaks but what if I give heat and then start to melts this phenomenon happens in factory when workers give heat to glass and then they give shape to it, it means the glass can melt but if we heat glass in our home why It Breaks please anyone help me
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The glass breaks on heating due to thermal shock. Whenever there is difference in temperature between two surfaces of the glass, the thermal expansion of one side with respect to other side induces stress in the material. When this stress reaches above the yield strength of the material the cracks start to develop. As glass is an amorphous solid, it is brittle in nature and thus on development of its first crack, the glass shatters into pieces.
While shaping/moulding (hot glass) a stress is developed in the glass due to bending and shear. If the glass is cooled upto room temperature suddenly, another stress called as thermal stress develops in the glass. These stresses are compressive in nature. Only those glass breaks at heating that haven't been tempered after shaping/moulding. That doesn't mean that a tempered glass wouldn't break at any temperature. Tempering is done upto a certain limit considering the use or requirement of the glassware. For example a borosilicate glassware used in laboratory will have higher temperature limit than a cooking glassware as the temperature in labs may reach higher than in kitchen. So if the temperature reaches above its tempering limit then any glass would break. But a tempered glass has high range of resisting temperature. Glasses with different tempering conditions breaks at different temperatures. Toughened glass is used now a days for glass stairs, roofs, swimming pools, walls, aquarium, safety glass in banks, bunkers, museums and other secured places to protect the valuables. A bulletproof (bullet resistant) glass is a layers of laminated tempered glass that can even sustain a bunch of high impact bullet from an automatic rifle.
If the glass is heated beyond it's melting point then the glass starts to melt and turns into liquid.
It's big but helpful.. Hope so
While shaping/moulding (hot glass) a stress is developed in the glass due to bending and shear. If the glass is cooled upto room temperature suddenly, another stress called as thermal stress develops in the glass. These stresses are compressive in nature. Only those glass breaks at heating that haven't been tempered after shaping/moulding. That doesn't mean that a tempered glass wouldn't break at any temperature. Tempering is done upto a certain limit considering the use or requirement of the glassware. For example a borosilicate glassware used in laboratory will have higher temperature limit than a cooking glassware as the temperature in labs may reach higher than in kitchen. So if the temperature reaches above its tempering limit then any glass would break. But a tempered glass has high range of resisting temperature. Glasses with different tempering conditions breaks at different temperatures. Toughened glass is used now a days for glass stairs, roofs, swimming pools, walls, aquarium, safety glass in banks, bunkers, museums and other secured places to protect the valuables. A bulletproof (bullet resistant) glass is a layers of laminated tempered glass that can even sustain a bunch of high impact bullet from an automatic rifle.
If the glass is heated beyond it's melting point then the glass starts to melt and turns into liquid.
It's big but helpful.. Hope so
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I think that they give more heat than us that's why they melt
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