It is the melt point of a material as measured using a Mettler Toledo "Drop Point" Instrument which specifically is designed to observe the point at which the material begins to flow as a liquid drop out the bottom of a small hole in a premade sample cup that holds roughly less than 1 ml of material. As the material melts and flows out the botom hole, a light detecter observes the flow and reports the Drop Melt Point. The viscosity of the material greatly influences the result.
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