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Questions tagged [wetting]

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3 votes
1 answer
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Height of a stable droplet on a perfectly wetting surface, shape of a water drop

I would like to clarify that this is not a homework question, but a problem that I chose to want to solve to satisfy my curiosity. I would like to understand whether the physical concepts I have ...
Bml's user avatar
  • 439
0 votes
1 answer
51 views

How does wetting cotton increase its UV transparency?

Anecdotally, a dry cotton T-shirt prevents sunburn better than a wet one. This has also been measured (Gambichler et al., "Influence of wetness on the ultraviolet protection factor (UPF) of ...
Camille Goudeseune's user avatar
2 votes
2 answers
439 views

Why do some objects tend to sink after some time in water even if they float at the start?

I have observed this phenomenon in swimming pools: I have seen many dead insects floating on the surface, but after some time some they tend to sink down without any external influence. Why does this ...
Naveen V's user avatar
  • 648
2 votes
0 answers
22 views

How to make straight wetting angle between water and glass

Looking for any liquid (preferably non hazard and transparent) which is immiscible with water in order to make a 90 degrees wetting angle with glass. Water+liquid should from a 90 degrees wetting ...
2Napasa's user avatar
  • 161
0 votes
1 answer
74 views

What does a negative wetting tension $\delta F$ mean?

If a solid polymer has a drop of liquid (water) and shows a negative value of wetting tension, what does this mean? Does this mean that the drop of liquid will bead up instead of spreading on the ...
Uz1's user avatar
  • 1
1 vote
1 answer
52 views

Derivative of volume with respect to surface area in Young-Laplace $\frac{\partial V}{\partial A}=(1/R_1+1/R_2)^{−1}$

While studying Physical chemistry of interfaces, from: Page 42 (chapter 3 , section on "equilibrium conditions") in Butt, H. J., Graf, K., & Kappl, M. (2013). Physics and chemistry of ...
Dr. John's user avatar
  • 185
1 vote
1 answer
97 views

Which kind of paper has highest absorption speed? [closed]

I am experimenting to analyse the liquid wicking(radial) behaviour of various liquids. I have performed initial studies and experiments on household paper towels but they tend to deform and stick to ...
ashish.g's user avatar
  • 111
0 votes
0 answers
25 views

In nature, (generally) when liquid molecules lies on a solid surface which model does it came close with?

In nature, (generally) when liquid molecules lies on a solid surface which model does it came close with? {Does water molecules lies on solid interface with air pocket or without air pocket?} Cassie-...
Abinash's user avatar
1 vote
1 answer
58 views

Stainless Steel in Kitchen Dishwasher Doesn't Dry

I find that stainless steel tools, especially the shiny ones, stay wet after the (no heat) dry cycle while ceramic plates are dry. The water beads on the shiny surfaces but perhaps less on rougher ...
Incredible II's user avatar
1 vote
3 answers
472 views

How does surface tension prevent a pin from sinking?

Please explain simply how surface tension in water which as far as I understand is a force pulling the water molecules at the surface towards each other horizontally so how does that prevent a ...
Potato's user avatar
  • 33
2 votes
1 answer
63 views

Reason for motion of a fluid

I was making coffee for myself, when I observed that when I poured coffee from the frying pan (having curved edges), the fluid went directly into the cup without falling; but when I transferred coffee ...
imposter's user avatar
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0 votes
1 answer
38 views

Is there some easy way to change the wettability of a sphere?

I am doing some experiments with spheres impacting a body of water and would like to change the wettability of the sphere. Is there some relatively easy way to do this? A procedure in one paper is ...
Tom's user avatar
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6 votes
0 answers
850 views

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 ...
Gnubie's user avatar
  • 1,879
0 votes
1 answer
335 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 ...
Tofi's user avatar
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2 votes
1 answer
241 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?
Marijn 's user avatar
  • 3,348
8 votes
1 answer
516 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. ...
scrx2's user avatar
  • 1,428
1 vote
0 answers
266 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 ...
user avatar
69 votes
2 answers
8k 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 ...
Petr's user avatar
  • 3,109
2 votes
1 answer
367 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 ...
user2390934's user avatar
0 votes
0 answers
188 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 ...
Volker Siegel's user avatar
55 votes
3 answers
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 ...
Mark Eichenlaub's user avatar