Water –
Water is very important for our life. All living things like humans, animals, and plants need water to survive. Most of the Earth is covered with water, so we call Earth the Blue Planet.
Potable Water
Potable water means clean and safe water that we can drink.
Example: filtered, boiled water.
Solubility
Some things dissolve in water like sugar and salt.
Some things do not dissolve in water like sand and oil.
This ability to dissolve in water is called solubility.
Importance of Water in Everyday Life
We use water daily for:
- Drinking
- Cooking
- Bathing and cleaning
- Farming
- Industries
Water is needed everywhere!
Importance of Water for Living Organisms
Plants and animals also need water to stay alive.
Water helps plants make food and grow.
Animals drink water for survival.
Role of Water in the Growth of Plants
Water carries nutrients from soil to plants.
Seeds need water to sprout and grow.
Conservation of Water
We must save water because clean water is limited.
Ways to save water:
- Close taps when not in use
- Use bucket instead of shower
- Fix leaking taps
- Don’t waste drinking water
Rainwater Harvesting
Rainwater harvesting means collecting and storing rainwater for future use.
Example: rainwater stored in tanks on rooftops.
Water as a Universal Solvent
Water can dissolve many substances.
So, water is called the Universal Solvent.
Solute, Solvent, and Solution
- Solute → the substance that dissolves (like sugar)
- Solvent → the liquid that dissolves the solute (like water)
- Solution → the final mixture (like sugar water)
Water Resources
We get water from:
- Rivers, lakes, ponds
- Groundwater (wells, hand pumps)
- Rain
Oceans have salty water, not good for drinking.
Water Pollution
Water becomes dirty when:
- Trash is thrown into rivers
- Chemicals from factories mix with water
- Oil spills in seas
Dirty water harms humans, animals, and plants.
Quick Memory Tips
| Topic | Easy to Remember |
| Water on Earth | 2/3rd of Earth is water |
| Potable water | Safe to drink |
| Universal solvent | Water dissolves many things |
| Conservation | Save water! |
| Rainwater harvesting | Store rainwater |