What is the diameter of the capillary

Tubes with very small inner diameters are called capillaries. Usually refers to the inner diameter of the tube is equal to or less than 1 mm, because the diameter of the tube is as fine as hair so called capillary. It's used in medicine, it's used in building materials.

Although capillarity is of great help to the water absorption of plants, capillarity also has a negative effect on agricultural production. There are many capillary tubes in the soil, along which underground water often rises to the surface. If underground water is to be preserved, the soil above the ground should be hoed and the capillaries in the soil surface destroyed to reduce evaporation of water.

When building a house, there are many and thin capillaries in the crushed foundation, which draw water up from the soil and make the room damp. Linoleum is spread above the foundation when building a house to prevent the dampness caused by capillarity.

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