there is nothing to send today, so let's take a look at my own anti-bubble bar _ (: bubble "∠) _

. In the previous paragraph, I introduced the phenomenon of" antibubble "in the push. Contrary to the structure of soap bubbles, the droplet is surrounded by a layer of air film, and then the air layer is still a structure of the liquid. Compared with the liquid film of soap bubbles, the air film is more unstable, so this kind of bubbles generally exist for a short time.

(ordinary soap bubbles (left) and anti-bubbles (right))

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here are the anti-bubbles I photographed in the glass:

generally speaking, it is easy to "blow" anti-bubbles. As long as you add a little detergent to the water, and then use an eyedropper to absorb the liquid and keep dripping onto the liquid surface, there will always be some anti-bubble formation. Pay attention to the detergent can not be added too much, otherwise the operation is easy to accumulate foam on the liquid surface. The droplet must hit the liquid surface at a certain speed before it can be immersed into the liquid with the air film, otherwise the droplet will only be suspended on the liquid surface temporarily. In the video, we can see that the anti-bubbles burst under the liquid surface, and the air film becomes a lot of tiny bubbles floating on the surface, thus proving that they are not ordinary underwater bubbles.

the last part is an antibubble made from a blue solution, but only one blue antibubble was successfully photographed. Through it, you can clearly see the structure of the air film wrapped around the liquid. The blue liquid here uses the vanishing ink introduced earlier. The advantage over ordinary pigment is that the color disappears automatically when a small amount of it is dripped into the water (because it uses the acid-base indicator thymol phthalein, and when diluted, the pH decreases to become colorless), so that the whole glass of water will not be dyed blue quickly.

I tried using the eyedropper and washing the bottle, and the result is that the eyedropper is easier to use, which can make the eyedropper mouth a little further away from the liquid surface and increase the falling speed of the droplet. If you are interested, come and try it.