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5 minutes science - Physical experiment: Vortex in my paintbucket by kalemandra

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· @kalemandra · (edited)
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5 minutes science - Physical experiment: Vortex in my paintbucket
This is the first part of my new series about everyday science! Especially for children who are in "home-office", instead of school.

I'm really fascinated by an  interesting phenomenon, when I drip different paints in a solvent, like water. Or just play with a cup of cappuchino. The paint particles often form a beautiful vortex before they totally mixed with the water or other liquid. The spiral bellow was a tiny one (the size of my nail), so I used my mobile phone as a magnifyer.   

I washed my paint brush (I used it in aniline) in the water and then dripped a little white acrylic paint in it.   A tiny vortex formed because I previously mixed the water with the brush and it was still moving. Luckily, I was able to take photos quickly before it disappeared. Paint pouring or Japanese paper marbling is a great and creative activity, when you can observe vortices as well.

![20200206_202749 (1).jpg](https://images.hive.blog/DQmQM92TKrqhR47Q1LadjhzsD218voRPUbJgKPyQAj96yKC/20200206_202749%20(1).jpg)

What is the explanation?
Vortex is a phenomenon occurring in flowing liquids or gases in which a part of the flowing material revolves around an axis (this axis may even be curved). Vortices are caused by internal friction and unevenness of the driving force or adjacent surfaces. In the air or in rivers, vortices can be formed around solid bodies (in rivers, for example, at the foot of a bridge) or at the interface of contact currents. It develops much more slowly in dense material, making it easier to observe. 

Excersizes:
1. Play with paints in a glass of water and take photos of them. Try it with different liquids, like oil, milk or dilute wallpaper glue. What happens if you put an obstacle ( a small thing like wooden  stick or spoon) in the way of the vortex?
2. Where you can also find vortices?
Keywords:  hurricane, tornado, Jupiter, galaxy, aerodynamics, vortex, Kármán-vortex, sinker, etc.
Find them by google and collect the pictures!  Sketch them on a paper or excersize book!

### With lots of love from Kalemandra
![unnamed (2)-1.jpg](https://images.hive.blog/DQmXbtwGaHcv5D6xLtQ879RFoGYfCf4r1fMhGZp5X5FR2S5/unnamed%20(2)-1.jpg)


![57503140_2365627840346915_5333273917526114304_n.jpg](https://images.hive.blog/DQmU6hxVRRGzCbgiQg4KDoiFX5PUwsAWvYwnBzpfg9P5voN/57503140_2365627840346915_5333273917526114304_n.jpg)

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