Adhesion causes capillary action
The molecules of water are sticky in nature because of the adhesion and cohesion properties. By hydrogen bonding between the water molecules and the surface of the vessel causes the water to stick with them. The water molecules attach to the wall of the vessel because of the adhesion between the two different elements.
This attraction causes the water to move in the upward direction in the capillary, which results in the formation of the meniscus that turns upwards. Here surface tension is also acting, which is holding the surface intact. When the adhesion forces between the water molecules and that of walls of vessels are more potent than the cohesion forces of water molecules, then the capillary action takes place. The water molecules in the capillary will stop moving in upwards direction at some point because of the surface tension and gravity acting on it.
Significance of adhesive property of water
The adhesive property of water along with cohesive property play an important role that affects the living and non-living things in the environment.
The adhesive property allows water to flow in the opposite direction of the gravitational force, which has many applications in the environment, such as it allows the movement of blood through the thin vessels in some organisms.
It also plays an essential role in the plants to transport water in the upward direction to the leaves via transpiration stream. The water molecules get attached to the wall of xylem, and with this continuous process, the water molecules move towards the leaves and to the top of the plant.
Because of adhesive properties, the soil is able to hold the water, and then roots take up the water molecules that are stick to the root hairs and then transport them to the other parts of the plant.
The adhesive forces in the capillary action in the glass tube are exerted by the internal surface of the glass. This is because of the attraction between the charges or polar surface and water molecules.
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