Salt Volcano

We know that oil and water doesn't mix...but what happens when you add salt? Let's play with science and find out!

  1. Ages: 3 - 6

  2. <30 minutes

  3. Messy

Step-by-step tutorial

  • Step 1

    This neato experiment only needs a few ingredients that everyone will have!

    Photo reference of how to complete step 1

  • Step 2

    We poured the water into the jar. Maddie filled it about 2/3 full.

    Photo reference of how to complete step 2

  • Step 3

    Next went in the oil--about 1/3 of a cup or so.

    Photo reference of how to complete step 3

  • Step 4

    One single drop of food coloring...

    Photo reference of how to complete step 4

  • Step 5

    There it is, there...what is it doing? Hmm...just sitting there, resting at the bottom of the oil...

    Photo reference of how to complete step 5

  • Step 6

    Maddie shook on some salt.....

    Photo reference of how to complete step 6

  • Step 7

    Whoa!! What's it doing!?!

    Photo reference of how to complete step 7

  • Done!

    Oil is less dense than water, so it floats on top of water. When salt is dumped on, it sinks through the oil taking some of the oil with it to the bottom of the jar. As the salt dissolves in the water, the oil rises back up to the top of the jar.... creating movement over and over again. Go ahead! Put more salt in! Then do it again!!

    Photo reference of how to complete step 8

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