WATER: FACTS AND USES

·       Water:

     Molar mass: 18.01528 g/mol

Boiling point: 99.98 °C

Melting point: 0 °C

Formula: H2O

        Triple point temperature: 0.01 °C

        IUPAC  ID: Water, Oxidane

·       Water covers 71% of the earth’s surface.

·       96.5% of waters of the earth found in Seas and Oceans.

·       Water on Earth moves continually through the water cycle of evaporation and transpiration (evapotranspiration), condensation and precipitation.

·       Approximately 70% of the fresh water used by humans goes to agriculture.

·       A report, issued in November 2009, suggests that by 2030, in some developing regions of the world, water demand will exceed supply by 50%.

·       Water is the only substance that occurs naturally as a solid (ice), a liquid and a gas (water vapor).

·       When the rain falls then water fills the empty spaces and cracks above that layer. The top of the water in the soil, sand, or rocks is called the water table and the water that fills the empty spaces and cracks is called ground water.

·       Water that is safe for drinking is called potable water.

·       Water makes up more than two thirds of human body weight, and without water, we would die in a few days.

·       Water running down from the land surface adds to the ground water and is called recharge water.

·       The largest use of ground water is to irrigate crops.

·       Water serves as a lubricant in digestion and almost all other body processes.

·       Water regulates body temperature.

·       Percentage of Water in Our Tissues:

Tissue	Percent Water
Blood	83.0
Heart	79.2
Muscle	75.6
Brain	74.8
Skin	72.0
Bone	22.0

·         Water keeps your mouth moist and washes away dirt and grim on your eyes. 

·       Our bodies must maintain a very specific pH level of 7.4.  Water is a reactant in a very important reaction that maintains pH at 7.4.