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1) Dish soap`s molecules are non-polar and water`s molecules are polar.
2) Milk has lots of fat (non-polar molecules)
3) "Like dissolves like" (basic chemistry anyone?) Non-polar soap is attracted to non-polar fat. The dyes get swirled around by the attraction between the soap and fat.
4) Density has nothing to do with it. The dyes are just there for aesthetic purposes. The colors add nothing to the chemical reaction going on here.
As I watched it I said to myself, "Well I never would have dreamed it up myself but that makes sense - fat content in milk plus grease-cutting action in detergent plus dye equals nice little saucer of moving color." Sure.
Oh, this video along with one of the comments reminded me of a graphic design you can do by the following:
1) mix soap, water and food coloring 2) with a straw, blow bubbles in the mixture3) place paper on bubbles4) marvel at your creation.
SuperStingra,A molecule of soap has a polar head (OH groups or charges due to acid or base groups) and a non-polar tail (Carbon-Carbon links surrounded by Carbon-Hydrogen links). When soap molecules go into the milk, they break down the fat globules present by sticking their tail into them (since fat is non-polar, therefore tail attracted to fat), while constantly orienting their head towards the aqueous phase of the milk (since water is polar, therefore head attracted to water). All this fat globule breakdown creates turbulence and mixes up the system, along with the food coloring present, creating this amusing effect.
Has to be milk with more fat content like 1% or more.
[supercook green food colouring]
Whats that?? You use vegetable food coloring which is water based.
[and persil baking soda washing up liquid.]
Err? Are you a hippy? lol You have to use a dish washing liquid that is a degreaser, like Dawn. Can`t be some hippy dippy green tree hugger products in this experiment. lol
I did this with my kids (3&4yrs old) and they loved it. It was wicked cool. When it started slowing down, we drizzled a little more dishwashing liquid in and then slowly rotated the dish a little. Very cool.
And theres lots of fat in milk
Considering she probably did this in elementary school, yes, I`m surprised she didn`t say she smoked it.
Or... am I just a phsycic?
Pretty neat anyways.
Wanna try it.