If you fill the capillary tube all the way to the top, it will become difficult to obtain a sharp melting point.
What is melting point?
The melting point of a solid is the temperature at which a solid is changed into a liquid upon application of heat.
If you fill the capillary tube all the way to the top, it will become difficult to obtain a sharp melting point thus it should be filled only to about 2 - 3 mm.
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