FAITH 576 cal/g. This results in evaporative

FAITHNYOKABI 653825 1.Cohesion: is the stickingtogether of similar molecules. Water is very cohesive. This allows water to bepulled along a pathway with relative ease.

Oneof the most important effects of these forces is keeping large molecules organizedand arranged in a way that enables them to function properly in cells. Treesdepend on cohesion and adhesion to help transport water from their roots totheir leaves. The evaporation of water from leaves pulls water upward from theroots through narrow tubes in the trunk of the tree. As a result of cohesion,water moves against the force of gravity even to the top of a very tall tree. 2.Surface Tension:cohesion allows water to pull together and form droplets or form an interfacebetween it and other surfaces.

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The measure of how hard it is to break thisinterface is its surface tension. Water allows materials to rest upon it if thesurface tension is not broken. Pollen, dust, water insects, and otherbiological materials are able to remain on the surface of the water because ofthis tension. 3. Adhesion:The sticking of one substance to another. Water is a good adhesive.

It willcling on to many objects and act as glue. Capillary Action is an example ofcohesion and adhesion working together to move water up a thin tube. 4. HighSpecific Heat: This high specific heat allows water to act as a heat sink.Water will retain its temperature after absorbing large amounts of heat, andretain its temperature after losing equally large amounts of heat. The reasonfor this is that Hydrogen bonds must absorb heat to break. They must releaseheat when they form. The Ocean acts as a tremendous heat sink to moderate theearth’s temperature.

5. High Heatof Vaporization: Water must absorb a certain amount of additional heat tochange from a liquid into a gas. This extra heat is called heat ofvaporization. In humans, this value is 576 cal/g.

This results in evaporativecooling of the surface. Water removes much more heat from a surface uponevaporation than does either alcohol.    6. Freezingand Expansion of Water: Water is most dense at 4 degrees C. At ) degrees is 10% less dense.

Ice floats because maximum Hydrogen bonding occurs at 0degrees C. Once again, hydrogen bonds are the reason. Because themolecules in liquid water are moving faster than those in ice, there are fewerand more short-lived hydrogen bonds between molecules. The liquid watermolecules can fit more closely together than the molecules in ice.

Sincesubstances of lesser density float in substances of greater density, ice floatsin liquid water. If ice sank, it wouldform on the bottom of a body of water as the water was cooling. Ponds and lakeswould freeze from the bottom up, trapping the fish and other organisms in ashrinking layer of water without access to the nutrients from the muddy bottom.7.

Versatile Solvent:Water is a major solvent in nature. When water and another substance is mixedthe resulting solution is called an aqueous solution. Wateris the main solvent inside all cells, in blood, and in plant sap.

Waterdissolves an enormous variety of solutes necessary for life. REFERENCES…/what-are-the-properties-of-water-unique-properties-that-support   


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