Back to: Basic Technology Primary 3
Welcome to class!
In today’s class, we’re going to continue our journey into the world of water purification by exploring various ways to make water clean and safe to drink.
Ways of Purifying Water
Water from nature is not always pure and safe to drink. It can contain contaminants like dirt, bacteria, chemicals, and more. Purifying water is essential to remove these contaminants and make it safe for us to drink and use.
Different Methods of Water Purification
There are several methods to purify water, each with its own magic:
Boiling: This is one of the simplest and oldest methods. When you boil water for a few minutes, the heat kills harmful bacteria and viruses, making the water safe to drink.
Filtration: Water can be passed through different types of filters to trap particles and contaminants. Some filters use sand, charcoal, or even special membranes to clean the water.
Chemical Treatment: Chemicals like chlorine and iodine can be added to water to kill harmful microorganisms. These chemicals are often used in water treatment plants.
Ultraviolet (UV) Treatment: UV light is like magic for water. When water is exposed to UV rays, it damages the DNA of bacteria and viruses, making them harmless.
Distillation: This method involves boiling water and then collecting the steam, which leaves behind contaminants. The steam is then cooled and condensed back into clean water.
Reverse Osmosis: This is a high-tech method that uses a special membrane to remove tiny particles and impurities from water.
Solar Disinfection: In sunny places, leaving water in clear bottles in the sun for several hours can help kill harmful microorganisms. The sun’s UV rays work their magic!
In today’s class, we’ve explored various ways to purify water, from boiling and filtration to chemical treatment and UV rays. Each method is like a special tool to make water clean and safe.
Evaluation
Here’s a fun task: Try one or more of these water purification methods at home. You can boil water, use a simple filter like a cloth, or experiment with sunlight to purify water. Observe the changes and share your findings with the class!
Assignment
Why is it important to have different methods of water purification? Can you think of a situation where one method might be more useful than another?
We have come to the end of today’s class. I hope you enjoyed the class!
In the next class, we shall be discussing Common Uses of Water
In case you require further assistance or have any questions, feel free to ask in the comment section below, and trust us to respond as soon as possible. Cheers!
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