Glass jar (Mason jar works well)
Water
Food coloring / bio colors
Vegetable oil
Salt
~~Pour
about 3” inches water into the jar
~~Add
coloring (keep colors light)
~~Slowly
pour 1/3 cup vegetable oil into jar
~~Waite
until both layers have settled
*Hint
The oil
will sit on top of the water
~~Gently
shake salt into jar and count to 5
~~AS
you watch the oil and salt will form a “blob” and sink to the bottom of the jar
~~Keep
watching as the “Blob” floats back to the top of the water
~~Repeat
by shaking more salt into the jar
Ask the
children why the oil “blob” sank to the bottom and then floated back to the top?
Oil is lighter than water which is why it sits on top of it and since oil does not dissolve
it won’t mix with water.
Salt is heavier than water and it also dissolves in water so When you shake it onto the oil,
it clings to the oil “blob” and brings it to the bottom.
After the salt has had time to dissolve it releases the oil “blob” and it floats
to the top.