How does water get filtered while passing through sand, charcoal, etc.?
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Imagine you have a cup filled with dirty water. If you pour that water through a layer of sand, the sand will act like a strainer. It has tiny spaces between the grains, which are so small that they can trap or catch some of the impurities in the water. The water can pass through, but the dirt and other particles get stuck in the sand.
Now, let’s move on to charcoal. Charcoal is made by burning wood until it turns black and becomes really lightweight. It has a lot of tiny holes on its surface, kind of like a sponge. These holes can help remove some things from the water that the sand alone can’t get rid of, like chemicals or bad smells.
When we combine sand and charcoal in a filter, the water passes through the sand first. The sand takes out the bigger impurities. Then, the water goes through the charcoal. The charcoal’s tiny holes absorb some of the smaller impurities, making the water even cleaner.
By using both sand and charcoal in a filter, we can make dirty water much cleaner and safer to drink. This process is similar to what happens in some water treatment plants or when people go camping and use a water filter to make sure the water they drink is clean.
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