Objective: This experiment was conducted to determine how density affects water movement.
1. Prepare your materials: salt, 200ml of warm water for your salty ocean water and a half filled clear water (representing freshwater).
2. Create a mixture of salty water for your ocean. Make sure that your water is warm enough to dissolve all the salt. Add more salt until it can no longer be dissolve in your water mixture. Add food colouring, I used a blue colour to represent the ocean.
3. Pour your salty water in the bowl of clear water.
4. Observe the bowl from the side as you pour the water (as your helper pour the salty water).
As you can see the coloured salty water sinks to the bottom of the container, forming waves under the clear water above it. The salty water (ocean) is more dense than the clear water it will stay under the clear water.
Now another experiment we performed was to test how the water density affects the ability of an object to float. This case, we prepared another salty water (in a big bowl) and a clear water in a separate bowl. We used a boiled egg, as our test subject.
Drop the egg in the bowl of clear water. It sank into the bottom of the bowl right away.
Now we tested the same boiled egg in a bowl full of salty water. Once dropped, it sank for a second but then it started to float afterwards!! Mavi was in awe!!
In this case, it easier for humans to swim in the ocean because of the higher density of the salty water helps to keep our bodies higher in water :)