text: Using Lindemann's criterion to calculate this quantity gives a value proportional to the atomic spacing squared times the Debye frequency squared.
full_question: Using Lindemann's criterion to calculate this quantity gives a value proportional to the atomic spacing squared times the Debye frequency squared. For nanoparticles or small crystals, this property is dependent on size, per the Gibbs-Thomson equation. This property is higher for neopentane than for n-pentane or isopentane. When measuring this value, which can be done with a Thiele tube or a Fisher-Johns apparatus, more impure compounds will exhibit a larger range. A mixture with the lowest possible value for this measure is eutectic. For a solution, the depression of this value upon increase in concentration is a colligative property. For gallium, it's slightly above room temperature and for water it is 0 degrees Celsius. For 10 points, name this temperature at which solids become liquid.
first_sentence: Using Lindemann's criterion to calculate this quantity gives a value proportional to the atomic spacing squared times the Debye frequency squared.
raw_answer: melting point [accept freezing point]