Water

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  • Publicado : 10 de noviembre de 2010
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DEFINITION
Water is a chemical substance with the chemical formula H2O. Its molecule contains one oxygen and two hydrogen atoms.

STATES OF WATER
• Solid
• Liquid
• GasCHANGES IN STATE
Gas to Liquid
When a gas changes to a liquid, it goes through the process of Condensation. This is when the gas cools and loses energy. Then the particlesare forced to change state, from a gas to a liquid.
Liquid to Solid
When a liquid changes to a solid, it goes through the process of Freezing. This is when a liquid cools belowthe freezing point and loses energy. Then the particles are forced to change state, from a liquid to a solid.
Solid to Gas
When a solid changes directly to a gas, it goesthrough the process of Sublimation. The particles are forced to change state.
Liquid to Gas
The process in which a liquid changes into a gas is called Evaporation. When a liquidgains enough energy, it can overcome all of the attracting forces. Then it changes state, from a liquid to a gas.
Solid to Liquid
The process in which a solid changes into aliquid is called Melting. When a solid gains enough energy, it can overcome some of the attracting forces. Then it changes state, from a solid to a liquid.
Gas to Solid
When agas changes directly into a solid, without going through the liquid state, it is called Frost Formation.





WATER CYCLE



MESSAGE

• Water is the life blood ofour earth.
• No water, no life.
• Water is vital for life.
• Water is fundamental to photosynthesis and respiration.
• Drink potable water is essential for human.
• TheInstitute of Medicine; who recommend that, on average, women consume 2.2 liters and men 3.0 liters
• Contaminated water can cause death.
• Drink mineral water is healthy.
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