Water Density

This is a lovely little water density experiment. Great for fine motor skills too, with the pouring water and mixing. You will need; bicarbonate of soda, warm water, salt, sugar, fizzy water, and oil 6 jars/cups. Then 6 beads, 6 raisins, 6 leaves... you can use as many items as you find interesting.

If you don't have the resources to do these all at once, you could easily do 2 or 3 at a time.

Pour water into 1 jar/cup so that it is half full. Then pour 4 more jars/cups so they are full with water (leaving about 2 inches minimum, at the top). In the last jar/cup, pour fizzy water.

This is an example of what happens when you out grapes into plain water and salt water. In the salt water solution, they are floating...

Now for the mixing. You will need to label each jar cup somehow so you know which is which.
Jar 1: Half water and half oil.
Jar 2: Fizzy water
Jar 3: water with as many tablespoons of salt as you can dissolve (we stopped at 6)
Jar 4: water with as many tablespoons of sugar as you can dissolve (we stopped at 6)
Jar 5: plain water
Jar 6: water with as many tablespoons of bicarbonate of soda as you can dissolve (we stopped at 6)

You have a pile of items in front of each jar. Ask you child if you think they will sink or float (and why). Pop them in and watch - do they sink or float? Why do you think this is?

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