Question: Explain why it is possible to determine a melting point of caffeine (melting point greater than 200 degrees Celsius) even though the sublimation point is

Explain why it is possible to determine a melting point of caffeine (melting point greater than 200 degrees Celsius) even though the sublimation point is so low (less than 200 degrees Celsius). In other words, why is it possible to melt a sample of caffeine in the melting point apparatus when it only sublimed in the beaker when purified? Please list two criteria that are necessary to melt the sample.

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