Saltwater vs. Freshwater Experiment

As part of an ongoing project for my training coursework, I decided to introduce the children to an experiment with saltwater and freshwater.  I thought this would be an ideal time to cover the topic given that we have been talking about the beach/ocean and have been integrating a "summer" theme into the classroom. 

We have been discussing various types of bodies of water for some time and the children know about rivers and lakes.  Through their prior knowledge, they were able make connections with the different type of water we find in an ocean.  I presented this lesson at circletime to a very excited bunch of kids!  "Oh!  An experiment, I love experiments!" 

First, we filled the bowls with water.  Then, we added salt to one of the bowls.  We used popsicle sticks to take a "taste test" of the different types of water.  Their faces were priceless as they discovered the taste of the salt water!  Next, I showed an egg and asked what they thought would happen if we put it in the freshwater.  Then, we placed it in the bowl and watched it sink.  I asked what would happen if we placed it in the saltwater and then, to the delightful amazement of the kids, we watched it float!

I explained to the children that I would set this activity up at a table, but rather than using an egg, they could use a bar of soap.  Here is the lesson set up at a table:



Saltwater vs. Freshwater:   bar of soap in soapdish; two bowls of water - one with salt added; small towel for wiping any spills and drying fingers.  I added the book for interest and a globe so that the child could visualize the concept of 'oceans'.

 

"It floats in saltwater!"