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Your cart is empty. 💖Capillarity refers to the phenomenon of liquid rising or falling in spite of gravity due to differences in cohesion and adhesion in the inside of a thin tubular object. The phenomenon of causing a liquid to rise or fall along a pore when an object containing a fine pore comes into contact with it. When the adhesion between the liquid and the solid (tube wall) is greater than the cohesion of the liquid itself, capillary phenomenon (rise) will occur; On the contrary, when the adhesion between the liquid and the solid (tube wall) is less than the cohesion of the liquid itself, a fine phenomenon (decline) will occur. The concave surface of the liquid in the vertical tube and the ability of porous materials to absorb the liquid are caused by this phenomenon. Capillary action arises because water has the adhesive property that water molecules adhere to each other and to other objects, such as glass, cloth, organ tissue, or soil. Mercury, on the other hand, suffers from capillarity because of the strong cohesion between its atoms.
💖Melting point capillary Advantages: The sample amount is small (usually less than 0.1mg), you can observe the transformation and change process of the sample in the heating process, read the initial melting temperature value and the full melting temperature value of the sample, and calculate the boiling range value. Disadvantages: Almost no disadvantages, but the operation is slightly more complicated than the point capillary method.
💖Sampling capillary Advantages: Easy to operate. Disadvantages: The sample amount is large, the determination time is long, can not observe the transformation and change process of the sample in the heating process, the melting point of the unknown sample is measured due to the melting point range of the unknown sample, which will bring difficulties to the selection of bath solution. Correspondingly, the micromelting point determination method was invented to overcome the shortcomings of the capillary method.
💖1, the wall thickness of 0.1MM is very fine, the operation needs to be careful, there is a certain toughness, but fragile. 2, 0.1-0.5MM inner diameter capillary tubes are collectively referred to as point capillary tubes, both ends open, not sealed. 3, 0.9-1.1 inner diameter capillary refers to an uncertain value between the inner diameter range of 0.9-1.1, usually used to measure the melting point, and is called the melting point capillary is divided into sealed and unsealed, sealing refers to one end of the seal (not both ends of the seal oh!) It's one end. It's one end. The inner diameter of the melting point is larger than that of the point sample.
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