Interesting discovery?

A student

2009-02-06 9:07 pm

I found something very interesting when I hit a bottle of water with a stick/pen that is the water droplets being bounced off from the water surface do not return into the water(penetrate the water surface) and instead they turn into spheres and randomly move on the surface(Just like putting alkaline metal into water, it floats and randomly move around). More interestingly, after the water surface is calm again the droplet spheres disappear.

Is this phenomenon related to the surface tension of water? Does vibrations increase the tension? OR it is something else?

PS: The reason for the title to be written as that is to attract more people to answer or simply to look at this.

回答 (1)

用戶9394

2009-02-06 10:56 pm

✔ 最佳答案

Yes, this is something related to surface tension. When you disturb the water surface, droplets of water burst out into the air. This mist is mixed up with air so forming the bubbles. A bubble is a layer of liquid surrounded by the air inside. Since the surface tension of water is quite high, the bubble is not stable, it will break after a short time. I hope this can answer some of your doubts. If you add some detergent in the water, you can see bigger bubbles lasting for a long time.

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