![]() Because of water’s relatively high boiling point, most water exists in a liquid state on Earth. Hydrogen bonds also explain why water’s boiling point (100☌) is higher than the boiling points of similar substances without hydrogen bonds. It is the mechanism that is responsible for water transport in plants through roots and stems, and in animals through small blood vessels. As the hydrogen bonds keep interchanging with the straw's surface, the water molecules interchange positions and some begin to ascend the straw.Īdhesion and capillary action are necessary to the survival of most organisms. The water has created hydrogen bonds with the surface of the straw, causing the water to adhere to the sides of the straw. The water seems to climb up the straw before you even place your mouth on the straw. An example of capillary action is when you place a straw into a glass of water. This grip-like characteristic that water molecules form causes capillary action, the ability of a liquid to flow against gravity in a narrow space. This constant rearranging of hydrogen bonds allows a percentage of all the molecules in a given sample to bond to another substance. This process happens because hydrogen bonds are special in that they break and reform with great frequency. In terms of water, adhesion is the bonding of a water molecule to another substance, such as the sides of a leaf's veins. \): Droplets of dew cling to a spider web, demonstrating cohesion, the tendency of water molecules to stick together because of hydrogen bonds.Īnother important physical property of water is adhesion.
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