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Water
 

Water

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    Water Water Presentation Transcript

    • WATER Celeste Roderno-Desingaño, MS
      • Exists as solid, liquid and gas
      • Most common element on Earth and vital to all living organisms.
      • Covers 70% of the Earth’s surface
      • Provides a habitat for large numbers of aquatic organisms
      • Human body consists of about 65% water.
      Water (H 2 O)
      • Pure Water
      • Colorless, odorless, tasteless liquid
      • Freezing point: 0 ° C
      • Boiling point: 100 ° C
      • Natural Water
      • Never pure and always contains a variety of dissolved substances.
      • 97% of the Earth’s water is in the oceans
      • 2% is in the form of snow or ice
      • 1% fresh water for plants and animals
    • Properties of Water
      • Molecular Mass – 18g/mole
      • Polar molecule – positive and negative charge
        • H 2 O = H + and Oˉ
      • Provides the medium for metabolic reactions in organic cells and vital for transport of substances around the bodies of organisms
      • High specific heat
      • Boiling pt. is 100 ° C
      • Freezing pt. is 0 ° C
      • High surface tension
    • Water cycle (Hydrologic Cycle) The recycling and circulation of water through the biosphere
    • Hydrologic Cycle
      • Water provides for the needs of living organisms for survival.
      • Water is a raw material in photosynthesis to produce food.
      • Domestic uses: drinking, washing, bathing, cooking, used in farms and factories.
      • Distribution of water is not uniform.
    • The Processes involved in the Hydrologic Cycle
      • 1. Evaporation
      • The change of a liquid such as water to gas caused by sun’s heat.
        • Transpiration is the evaporation of water from plants.
      • 2. Condensation
      • The process of changing a gas into liquid when air cools to form clouds.
      • 3. Precipitation
      • Can be in the form of rain, snow or hail
    •  
      • Osmoregulation
      • The process that maintains an equable balance of water content in an organism
    • Osmoregulation
      • Water helps cells maintain their form
      • Water dissolves salts, sugars, proteins and substances involved in metabolism and digestion
    • Osmoregulation
      • Water enables transportation of body wastes
      • Water maintains a stable body temperature through perspiration and evaporation
    • Water….
      • Water is gained through:
      • Osmosis
      • Food
      • Respiration
      • Water is lost due to:
      • Evaporation
      • Urination
      • Bowel movement