Science with Sally - Term 4

Today Sally visited us again and taught us about wastewater. Wastewater is water that we use in our house. For example, toilet water, shower water, water that we use when we brush our teeth, washing machine water and water from the sink after washing the dishes or our hands.

Once the wastewater leaves our house it goes down the sewerage pipes to the sewerage treatment plant in Mangere. The water gets filtered and cleaned, before it makes its way back to the ocean.


Then we did an experiment using fresh water and salt water. 

In the first cup we had fresh water. In the second cup we had one teaspoon of salt water. In the third cup we had 2 teaspoons of salt water.

Then we had to add food colouring. We added yellow to the first cup, red to the second cup, and blue to the third cup. When we added the blue food colouring we noticed that the colour sat on the top of the water. 

We then mixed the food colouring in the water. 

Then we tried used a plastic tube to pick up all 3 colours. We tried to get all 3 colours in the tube. We did yellow first, then red, and blue last.

 

Here is Sione & Joshua with their plastic tubes. Both of them managed to make a rainbow in their tubes. 

         

Some of us even managed to make green!

What did you learn from today's science lesson with Sally?  

(Post your comments below!)