On capillarity In capillarity, when the liquid in the thin tube rises, where does the energy come from? Does something work on the water? What is the conversion of the gravitational potential energy? Is it the surface tension? What energy is consumed?

The reason of capillarity is that the surface of liquid is like a tensioned rubber film. If the liquid surface is curved, it tends to flatten. Therefore, the concave liquid exerts tension on the liquid below and the convex liquid exerts pressure on the liquid below

Surface tension data of water
Who knows the surface tension of 25 degree water?

71.97*10-3N·m-1
Surface tension of water at different temperatures

What's the point of reducing the surface tension of water?

If the surface tension is small, you can spread it ~ for example, if the pesticide is a ball on the large leaf surface, it is easy to roll down, so the efficiency of pesticide is very low. If the surface tension is reduced, it will not form a ball, but will spread out on the whole leaf, so the efficiency is high ~ anyway, things have two sides

Why does water have surface tension?

There are attractive and repulsive forces between liquid molecules, just like springs. However, inside the liquid, the springs are in a relaxed state. On the surface of the liquid, because of the contact with the gas, some molecules are in a state of evaporation or close to vaporization. The distance between the molecules is a little farther, which means that the springs are pulled apart. In this way, the forces between the molecules are expressed as gravitation, It is shown as "surface tension", the direction of the force is tangent to the liquid surface

Among the following phenomena, the phenomenon caused by surface tension is ()
A. When alcohol and water are mixed, the volume decreases. B. the rise and fall of the mercury column in the mercury thermometer. C. the water drops on the lotus leaf become spherical. D. when washing hair, when the hair is immersed in water, it is scattered. When it comes out of the water, the hair gathers together

A. The volume reduction of alcohol and water after mixing is due to the gap between the molecules. So a is wrong; B, the rise and fall of the mercury column in the mercury thermometer is due to the heat expansion and cold contraction of mercury. So B is wrong; C, the dew on the lotus leaf has surface tension, and the water molecules on its surface show gravity, which makes it shrink into a sphere, which is related to the surface tension, so C is correct; D, when washing hair When the hair is immersed in the water, it will disperse. When it comes out of the water, the hair will gather together because the distance between the water molecules on the hair surface is relatively large. The water molecules on the hair surface show gravity, which is related to the surface tension

Why is there tension on the surface of water?
Is tension related to the density of matter?

According to the mechanism of surface tension of water, there are attractive forces among the molecules of all substances: the attractive force between the molecules of the same kind of substance is called cohesion; the attractive force between the molecules of different substances is called adhesion. In hydrodynamics, water molecules are in constant Brownian motion, and there are attractive forces among water molecules. The smaller the distance between the molecules

How to increase the surface tension of water

Inorganic salt, nonvolatile acid, base (non surfactant)

Surface tension of water
Take a washbasin and fill it with clean water. First, gently put a coin on the surface of the water, and then gently put a few coins for the experiment,
1. Blow gently with your mouth to make the coin close gradually and write down what you see
2. If you gently touch one of them with a needle, what will happen to the others?
3. If you drop a little detergent on the water between coins, there will be "miracle". Write down the phenomenon you see

1. Lean together at last
2. Others will move with them
3. You'll see the coins spread around

How to break the surface tension of water~

The surface tension of water is related to the particle structure of water, which can only be reduced, but not completely

Among solid, liquid, gas and natural gas, which fuel has the greatest impact on air pollution

Natural gas

On capillarity In capillarity, when the liquid in the thin tube rises, where does the energy come from? Does something work on the water? What is the conversion of the gravitational potential energy? Is it the surface tension? What energy is consumed?