It is located in the trachea
Let us consider a drop of water in a river. The droplet flows to a larger body of water such as a lake. From here, or even from the river, the droplet changes from the liquid to the vapor phase via the process of evaporation and goes into the atmosphere. In the atmosphere, the droplet is condensed back into the liquid phase in the form of cloud. When a sufficient amount of water has been created in the clouds, it precipitates back on to the ground and flows into rivers and streams again.<span />
Capillary action is possible due to COHESION property of water.
Capillary action is defined as the movement of water within the spaces of porous materials due to the forces of cohesion and adhesion. Cohesion refers to the tendency of water molecules to stay together while adhesion refers to tendency of the water molecules to be attracted to other substances. In plants, capillary action moves water and the nutrients dissolved in it from the roots of the plants to the leaves in the branches.
