logo-mobile

We’ve Been Making Lava Lamps!

You know the mesmerizing feel of watching a lava lamp, with its large coloured bubbles sinking, rising, and morphing? This has been a fun science experiment this week for our students age 9-10 who made their own temporary DIY lava lamp using just household materials!

So, What Happened?

A lava lamp works because of two different scientific principles, density and polarity.

  • Density is the measurement of how compact a substance is – how much of it fits in a certain amount of space.

If you measure an equal volume of oil and water, you’ll find that the water is heavier than the same amount of oil. This is because water molecules are packed more tightly; a cup of water actually has more mass than a cup of oil. Because water is denser than oil, it will sink to the bottom when the two are put in the same container.

  • Polarity prevents the oil and water from mixing together.

Water molecules are “polar” because they have a lopsided electrical charge that attracts other atoms. The end of the molecule with the two hydrogen atoms is positively charged. The other end, with the oxygen, is negatively charged.

Oil molecules, however, are non-polar— they don’t have a positive or negative charge, so they are not attracted to the water molecules at all. This is why oil and water don’t mix!

Online-Tuition-Club-Advert-LAI-2
(C) The Tuition Club | 2 Dudley Street, Cheetham Hill, Manchester, M89DA

Pin It on Pinterest