1. Introduction and Applications of Melting Point Capillary Tubes: Melting point capillary tubes are small glass tubes primarily used for determining the melting point of substances. In experiments, the substance to be tested is loaded into the melting point capillary tube, heated to melt and then cool to solidify, and its melting point is measured. The advantages of using melting point capillary tubes include the ability to test small quantities with high measurement accuracy, making them suitable for the melting point detection of crystals or trace substances.

2. Introduction and Applications of Spotting Capillary Tubes: Spotting capillary tubes are miniature glass tubes generally employed for detecting the chemical composition of substances. In experiments, the substance to be tested is spotted in a test tube, and the tip of the spotting capillary tube is immersed into it. Liquid is slowly drawn into the capillary tube, allowing for the detection of its chemical composition and content. Spotting capillary tubes are suitable for detecting trace substances or biological samples.

3. Differences Between Melting Point Capillary Tubes and Spotting Capillary Tubes:

• Function: Melting point capillary tubes are used to determine the melting point of substances, while spotting capillary tubes are used to detect the chemical composition and content of substances.
• Application: Melting point capillary tubes are suitable for detecting the melting points of crystals or trace substances. Spotting capillary tubes are applicable for detecting trace substances or biological samples.

In summary, although both melting point capillary tubes and spotting capillary tubes are types of capillary tubes, they serve different purposes. This explanation helps to better understand and differentiate between melting point capillary tubes and spotting capillary tubes, taking into account their respective advantages, disadvantages, and applications. Choosing the appropriate capillary tube based on experimental needs ensures more accurate results.