The main difference between capillary tubes and glass tubes is their specific design and application.

Capillary:
- A capillary is a small tube with a narrow inner diameter, often used to accurately measure and transport small amounts of liquid or gas.
-Capillary tubes are usually made of materials such as glass, plastic, or metal and are designed to promote capillary action, which allows fluids to move without external force.
- These tubes are commonly used in laboratory settings, medical equipment, refrigeration systems, and industrial applications to complete tasks such as sample analysis, fluid transfer, and pressure regulation.

Glass tube:
- Glass tube is a tube made entirely of glass, the size, shape and composition of which may vary according to its intended use.
- Glass tubes are used in a wide variety of applications, including scientific experiments, chemical processing, manufacturing, and as components of laboratory equipment.
- Unlike capillary tubes, glass tubes do not necessarily have a narrow inner diameter or are designed specifically for capillary action. They can be used for a variety of purposes, such as containing, mixing, or transferring substances.

In summary, capillary tubes are a specialized type of tube designed for precise fluid handling and capillary action, while glass tubes cover a broader category of tubes made of glass and can serve a wide range of functions beyond capillary action.