laboratory capillary tube

Understanding Capillary Tubes: What They Are and How They Work

Capillary tubes are small and thin tubes used in various industries, including medical, food and beverage, and automotive. Despite their small size, capillary tubes play an essential role in various applications. They are used to transfer fluids, gases, and other substances from one location to another in a precise and controlled manner. This article provides a comprehensive explanation of what capillary tubes are, their uses, and how they work.

📋 Index of contents
  1. What are Capillary Tubes?
  2. How do Capillary Tubes Work?
  3. Uses of Capillary Tubes:
  4. Advantages of Capillary Tubes:
  5. Methodology of use
  6. What are the functions of capillaries?
  7. How tall is he?
  8. Laboratory capillary tube where to buy
  9. Laboratory capillary tube price
  10. FAQs:

What are Capillary Tubes?

Capillary tubes are small and thin tubes with a narrow inner diameter, usually ranging from 0.5 to 2 millimeters. They are made of various materials, including glass, plastic, and metal, depending on the intended use. Capillary tubes are designed to transport small amounts of fluids or gases in a precise and controlled manner.

How do Capillary Tubes Work?

Capillary tubes work based on the principle of capillary action. Capillary action is the ability of a liquid to flow in narrow spaces, against gravity, due to the interaction between the liquid and the tube's inner surface. The narrower the tube, the higher the capillary action. Capillary tubes use this principle to transport fluids and gases from one location to another.

Uses of Capillary Tubes:

Capillary tubes have various uses in different industries, including:

  1. Medical: Capillary tubes are used in medical laboratories to collect and analyze small amounts of blood or other body fluids. They are also used in medical equipment such as insulin pumps and blood glucose monitors.
  2. Food and Beverage: Capillary tubes are used in the food and beverage industry to measure small amounts of liquids, such as flavorings and colorings.
  3. Automotive: Capillary tubes are used in automotive applications, such as fuel injection systems and oil pressure gauges.
  4. HVAC: Capillary tubes are used in heating, ventilation, and air conditioning systems to regulate the flow of refrigerant.

It is used to melt solid samples and measure their melting point. It is used for the representation of capillarity. Where the narrowness of the tube will suck the liquid depending on the diameter. When the pipe length is small, the greater the pressure and height achieved. To measure the temperature of the molten substance. It is used to transfer solvents to a paper or object holder where an experiment will be carried out. In thin layer chromatography. Bring fluid to the lacrimal of the eyes.

The capillary tube
laboratory capillary tube

Advantages of Capillary Tubes:

Capillary tubes offer several advantages over other types of tubes, including:

  1. Precise and controlled transfer of fluids and gases.
  2. Small and compact size, making them ideal for applications where space is limited.
  3. Low cost compared to other types of tubes.
  4. Easy to manufacture in various materials and sizes.

Methodology of use

To melt solids, the sample is pulverized in a mortar. A maximum height of 3 ml is introduced into the capillary tube. Then heat the melting point determining apparatus to a temperature between 5°C to 10°C. Taking into account that it must be below the melting point of the sample. Start the gradual heating from 1°C to 1°C until it reaches 10°C.

Achieving the melting of the sample. For liquids, the capillary tube is taken and inserted into a container with liquid to be examined. The amount of the sample liquid should be about half the size of the tube. Demonstrating its capillarity. In f-layer chromatography, the capillary tube is used, sealing one of its ends. In the search for the melting point, one end of the capillary tube is sealed to introduce the solid sample. Proceed to close the other end of the capillary tube. Attach the tube to a thermometer at the same level of the bulb. Insert both into the glycerin being careful not to touch the bottom of the container. Turn on the lighter, make and record temperature readings. Until the solid is transformed into a liquid.

It is immersed in the standard solution. Then the plate is touched with the solution-containing tube as many times as necessary and allowed to dry. Then it is located in the center to start the determination.

What are the functions of capillaries?

To know what is the tendency of adhesion to the tube, to rise and lower above the water level. Represent the capillarity in a liquid substance.

How tall is he?

In general, it is 75 mm long. 1 mm wide. The diameter of the tube infers the suction and the height that the liquid takes inside the tube. If the length is the smaller the lower the height achieved.

The capillary tube
laboratory capillary tube

Laboratory capillary tube where to buy

In the electronic media on the internet several pages they offer sale of capillary tubes, for example: In free market and Amazon.

Laboratory capillary tube price

A box of capillaries 75 mm for 500.000 bs. One of brand memlocut 75 mm for 8,99 euros.

You can access this post whenever you need. Looking into the 7 reasons to meet the capillary tube.


Q: Can capillary tubes be used to transport solids? A: No, capillary tubes are designed to transport fluids and gases.

Q: What is the maximum length of a capillary tube? A: The maximum length of a capillary tube depends on the material and the intended use. In general, capillary tubes are relatively short, ranging from a few centimeters to a few meters.

Q: Are capillary tubes reusable? A: Capillary tubes can be reused, but they need to be cleaned thoroughly before each use to avoid contamination.

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Jose Hullgren (Laboratory Analist)

Hello to all readers, my name is Jose Hullgren, it is a pleasure to present you this website of my authorship, I am currently working as a laboratory analyst and for the last 10 years I have been working in the pharmaceutical industry. The main idea of this page is to provide relevant information in the field of the pharmaceutical industry above all. We also cover different areas of chemistry and sciences in general that we find interesting. Perfil Linkedin

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