joeu2perez asks:

In a bowl of water and pepper on top, why does pepper move away from the soap that has been dipped?

In Topics: Science fair
> 60 days ago



Feb 25, 2013
Subscribe to Expert

What the Expert Says:

I don't think soap will do the trick but you can try it. When you add detergent to water the surface tension of the water is lowered. Water normally bulges up a bit, like what you see when you look at a water drop. When the surface tension is lowered, the water wants to spread out. As the water flattens on the dish, the pepper that is floating on top of the water is carried to the outer edge of the plate.

Did you find this answer useful?
Answer this question


You are about to choose ${username}'s answer as the best answer.

Cancel | Continue

*You can change the best answer in the future if you think that you received a better answer

How likely are you to recommend to your friends and colleagues?

Not at all likely
Extremely likely