Quotation from: General ScienceWritten by: Bertha M. Clark |
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32. Molding of Glass and Forging of Iron. The fire which is hot enough to melt a lump of ice may not be hot enough to melt an iron poker; on the other hand, it may be sufficiently hot to melt a tin spoon. Different substances melt, or liquefy, at different temperatures; for example, ice melts at 0 deg. C., and tin at 233 deg. C., while iron requires the relatively high temperature of 1200 deg. C. Most substances have a definite melting or freezing point which never changes so long as the surrounding conditions remain the same.
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