Glass jar (Mason jar works well)
Food coloring / bio colors
about 3” inches water into the jar
coloring (keep colors light)
pour 1/3 cup vegetable oil into jar
until both layers have settled
will sit on top of the water
shake salt into jar and count to 5
you watch the oil and salt will form a “blob” and sink to the bottom of the jar
watching as the “Blob” floats back to the top of the water
by shaking more salt into the jar
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.