Questions tagged [wetting]

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When does water decrease or increase friction?

Water often acts as a lubricant e.g. a wet floor or road, but sometimes the reverse happens e.g. putting on wet clothes. I understand that surface tension is involved e.g. microscope slides sticking ...
0
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2answers
44 views

The vertical component of surface tensions in wetting

To find the contact angle made by a droplet on a flat surface at equilibrium, we take the sum of all surface tensions at the boundary of the droplet to be equal to zero (Wikipedia link). Projecting ...
2
votes
1answer
58 views

What determines the size of a straw/pipe to stop a liquid running out of it when closing one end of it?

When I put a finger on a straw with water in it, it wouldn't fall out of this straw. But is there maximum size (length and diameter) of this straw/pipe to get this effect and what causes this limit?
8
votes
1answer
269 views

Physics of dunking biscuits

Together with my 5 years old assistant, after endless observations breakfast after breakfast, we finally decided to be serious about it, and quantify a remarkable property of biscuits in milk. ...
1
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0answers
242 views

Drop of water in zero gravity [closed]

Suppose there is a drop of water in gravity-free space. A man slowly touches the drop and keeps his fingers touched. What happens? Does the drop change its shape? Or wet his fingers? Or there is no ...
65
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2answers
5k views

Why does wet hair keep its shape when it dries?

When I wash my hair and go to sleep, my hair is impossible to comb in the morning, stubbornly sticking to the shape it assumed during the night. The only way to get it right is to wet it again and ...
2
votes
1answer
169 views

Why is the liquid surface concave when it wets a container?

As you can see in this diagram the surface of the liquid is concave, why is the part of the liquid surface adjacent to the container has higher height than the rest of the surface, is it because it's ...
0
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0answers
145 views

Wetting the surface for soaking Nylon fabric in metal

I'm trying to create metal covered lace. My sister would use it as an artistic material. An interesting material A relevant point is that the mechanical rigidity of the metal is used, so it is not ...
58
votes
3answers
5k views

How small does sand have to be to get wet?

I think of sand as a lot of very small rocks. Suppose I have a pile of rocks, each about 1cm in size, and the pile is a meter tall. If I pour a bucket of water on the rocks, most of the water will ...