HAPPY Saturday! The last 1 and a half days have been spent intensely focused (and swearing) on Xero while I finish up the end of year accounts. I feel like a responsible adult. This morning called for a bit of a break away from the computer so Izzy and I jumped outside to create our own Salt Lava Lamp.
We have been exploring surface tension and density over the last couple of weeks which Izzy has absolutely loved so it has been experiments on repeat! This could go on for a while.
Oil and water are immiscible liquids which means that although they are both a liquid, the can never be mixed together. The reason why this experiment has a lava lamp effect is because oil is lighter than water so it floats on top. When you add the salt, it makes the oil heavier which forces it to sink to the bottom. The salt then starts to dissolve in the water and as it does, it releases the oil which then floats back to the top.
It’s quite hard to show the wee bubbles in pictures so make sure you watch the wee video at the end to see it in action! (Yes, my video skills need a bit of work!)
What you’ll need
– a glass
– food colouring
– vegetable or canola or sunflower oil
What to do
– Fill your glass 3/4 of the way full with water.
– Top up with oil and add a few drops of food colouring.
– Grab your salt and start sprinkling! You’ll notice that oil will sink to the bottom and as the salt dissolves, it will return to the surface which creates a lava lamp effect.