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A commercial soda - lime silicate melt has a crystal melting temperature ( liquidus temperature ) of 1 0 1 0 oC , a TTT

A commercial soda $-$ lime silicate melt has a crystal melting temperature $($ liquidus temperature $)$ of $1010$ oC $,$ a TTT nose temperature of $955$ oC $,$ a glass transition temperature of $550$ oC $,$ and a TTT nose time of $45$ seconds. What is the critical cooling rate for this melt to form a glass? Answers are in oC $/$ second $.$

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