What is capillary phenomenon? What is the phenomenon of capillaries?

Capillarity. capillarity) refers to the radius of curvature at some linearity small enough to meet the meniscus of liquid.

Compare the phenomenon that occurs in the capillaries. The entire surface of the liquid in the capillary becomes curved, and the interaction between the liquid-solid molecules extends to the entire liquid. Capillary phenomena that are common in daily life, such as water elevating in thin glass tubes due to its ability to wet glass; Conversely, mercury.

But it fell in it because it could not wet the glass. The reason for this is all due to the surface tension of the liquid.

and the effect of the pressure difference between the inside and outside of the surface.

The surface of the liquid resembles a tensile rubber film, and if the liquid surface is curved, it has a tendency to flatten. Therefore, the concave liquid exerts a tensile force on the liquid underneath, and the convex liquid exerts pressure on the liquid underneath. The liquid surface of the infiltrated liquid in the capillary is concave, it exerts a pulling force on the liquid below, so that the liquid rises along the pipe wall, and when the upward pulling force is equal to the gravity of the liquid column in the tube, the liquid in the tube stops rising and reaches equilibrium.

The same analysis can also explain the phenomenon of non-wetting liquid falling within the capillary.

Capillary phenomenon (also known as capillary action) refers to the phenomenon that a liquid changes on the inside of a thin tubular object due to the difference in its surface tension (cohesion) and adhesion, overcoming gravity.

Capillary action, which is the attraction of a liquid surface to a solid surface. The capillary is inserted into the infiltrated liquid, and the liquid level in the tube rises, which is higher than the outside of the tube, and the capillary is inserted into the non-infiltrated liquid, and the liquid in the tube descends and is lower than the outside of the tube. Towels absorb water, and groundwater rises along the soil are capillaries.

Put a drop of mercury on a clean glass plate, and it will roll around without attaching to the glass plate. A clean glass plate is soaked in mercury and then removed, and no mercury is attached to the glass. This phenomenon in which the liquid does not adhere to a solid surface is called non-wetting.

In the case of glass, mercury does not infiltrate the liquid.

The phenomenon of the infiltrated liquid rising in the thin tube and the phenomenon of the non-infiltrating liquid decreasing in the thin tube is called capillary phenomenon.

Capillary phenomenon (also known as capillary action) refers to the phenomenon that the liquid rises on the inside of a thin tubular object due to the difference in cohesion and adhesion, overcoming the gravitational attraction of the geocentric gaze. The most common example of capillary phenomenon is the ability to absorb water absorbed by plant roots through vascular bundles within the stem. Capillary phenomenon occurs when the adhesion between the liquid and the solid (tube wall) is greater than the cohesion of the liquid itself.

This phenomenon is caused by the concave or convex surface of the liquid in a perpendicular tube, as well as the ability of porous objects to absorb liquids.

Capillary phenomenon of water.

Capillary tube is often used as a description of capillary phenomenon, when the bottom of the vertical thin glass tube is placed in a liquid (such as water), the adhesion of the pipe wall to the water will make the liquid surface slightly higher than **; It will not stop rising until the cohesive force of the liquid is no longer able to overcome its weight. In capillaries, the weight of the liquid column is proportional to the square of the pipe diameter, but the contact area between the liquid and the pipe wall is only proportional to the pipe diameter. This allows the narrower capillary to absorb more water than the wider capillary. For example, a thin glass tube with a diameter of millimeters can theoretically lift water by centimeters, but when actually observed at a slightly lower height of silver.

Capillary phenomenon of mercury.

In some liquid-solid combinations, the condition of water absorption is slightly different from that of a capillary tube, such as a thin glass tube and mercury (mercury), the atomic cohesion of the mercury column itself is greater than the adhesion between the mercury column and the tube wall, so the liquid level of the mercury column ** will be slightly more convex than the surrounding area, which is the opposite of the capillary water absorption.

The principle of capillary phenomenon is utilized.

This kind of Christmas tree is based on the principle of capillary vertical meditation. When the paper tree is immersed in a certain salt solution, the solution rises rapidly in the paper tree by capillary phenomenon, reaching the end of the branch of the paper tree, and the water at the end evaporates first, and there will be crystallization, these solutions absorb the color pigments smeared on the paper tree in advance, so the tree grows colorful flowers.

The height of the Colorful Magic Christmas Tree is usually no more than 10 centimeters, and it is generally composed of two paper shells, which are usually painted with colorful paints, and the purchaser only needs to place the two paper shells crossed into a small tray and pour a packet of transparent liquid inside. Aftermath.

Capillary phenomena are phenomena that occur in capillaries that are small enough to be compared to the radius of curvature of a liquid meniscus. A small glass tube is inserted into the water, and the water will rise to a certain height in the tube before stopping; However, when a small glass tube is inserted into the mercury, the mercury will drop a certain height in the tube; This is the capillary phenomenon that occurs at the interface of solid, liquid and gas.

Capillary action is the attraction of the liquid surface to the solid surface. The capillary is inserted into the infiltrated liquid, and the liquid level in the tube rises to a higher level than the liquid level outside the tube. The capillary is inserted into the non-wetting liquid, and the liquid inside the tube drops below the liquid level outside the tube. This phenomenon is known as capillary phenomenon.

The phenomenon of water rising along the capillary has a great impact on agricultural production. There are many capillaries in the soil, and water from the ground often rises up to the surface along these capillaries. If you want to preserve water in the ground, you should hoe the soil on the ground and destroy the capillaries on the surface of the soil to reduce water evaporation.