Surface tension and density are two topics we explored in depth a few weeks ago and this wee density experiment was a hit with Izzy. As yesterday was a homeschool day, we decided to have another play around with it.
Water and oil are immiscible liquids. This means that no matter how hard you try, no matter how hard you try, you cannot mix them together. Water molecules are only attracted to water molecules and oil molecules are only attracted to oil. Oil is less dense than water so it will always float on top while water will always sink to the bottom.
There is nothing much to this density experiment but it is a whole heap of fun! If you’re after another density experiment, give the Salt Lava Lamps a whirl!
What you’ll need
– oil- preferably baby oil as it’s clear but any other oil will work.
– food colouring
– pipettes or teaspoons
– a plastic cup or a glass you will no longer use to hold the baby oil and small dishes or plastic cups for your coloured water
What to do
– Fill your plastic cup or glass with baby oil and mix together your coloured water. We used 5 different colours for ours.
– Grab your spoons or pipettes and get dropping! You’ll notice that the water drops will float to the bottom and eventually pool together!
Pretty simple right? You can mix it up by changing up your coloured water, squirting two colours at a time or even three!