Questions tagged [capillary-action]

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Vacuum capillary to sample pressure at 1 atm

I've been trying to design a system to measure pressure at 1 atm using an RGA (Residual Gas Analyzer) from a vacuum. However, this is higher pressure than the RGA is used to (it likes to measure at ...
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Capillary vs viscous pressure driven flows

Under what conditions a flow is capillary pressure driven and viscous pressure driven?
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Is capillary pressure significant?

I have a hydraulic system pressure to be measured in cm of water. It is done by tapping a graded tube, and simply measuring the height of the water column (usually at around 10-20 cm of water). If I ...
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Capillary and laplace pressure

How do I understand the difference between capillary and laplace pressures in the context of liquid interfaces?
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Ability of some porous solids to tentatively sit on water for a while before sinking

How does a porous solid such as the cereal "Wheatena" manage to tentatively sit on water for a while before sinking? I assume it initially somehow evades capillary action, perhaps through ...
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Optics and capillary

In a small capillary of radius 0.5mm, the water inside raises by 10cm above the water surface. The angle of contact is 60deg due to some impurity which does not affect density or refractive index=4/3 ...
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Which surface tension tension to consider in problems of liquid with solid interactons?

I came across a basic problem of finding height of meniscus rise of water, there the surface tension used for calculation was that of liq-air but my primary guess is liq-glass (solid) as that is the ...
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Capillary action in an ice tube

Capillary action happens in a thin glass tube because the silicon atoms in the glass molecules interact strongly with the polar water molecules (I learned this from the Khan Academy video on the topic)...
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Impact of salt concentration on capillary action

My understanding of capillary action is that it is fundamentally a result of the polar nature of the water molecule. So does the presence of the positive and negative ions of Na+ and Cl- disrupt the ...
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Water coming out of a capillary tube when height is reduced below initial level

Consider a capillary tube of height $H_1$. Water raises to a height $h_1$ in this tube. Now the capillary tube is cut such that its new height is $H_2 < h_1$. I've read in many textbooks and other ...
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What is the mistake in this derivation of capillary rise, using equal pressures at equal height?

I have seen derivations of capillary height using force equations: $$2\pi RT \cos{\theta} = \rho \pi R^{2}hg$$ which gives, $$h = \frac{2T\cos{\theta}}{\rho gR}$$ Now, if we go about this another way, ...
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Micrometric glass beads sticking on glass or plastic funnel wall

I am making a granular raft on a water-air interface. Granular rafts are made of micrometric or millimetric particles generally heavier than the liquid but still float on the interface due to their ...
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Molecular origin of solid-liquid and solid-vapour surface tension

I understand that surface tension arises at the liquid-vapour interface due to the asymmetric nature of long-range attractive forces and the short-range repulsive forces acting on the interface where ...
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Wetting liquids should NOT rise in a capillary tube according the gauge (Laplace) pressure formula. But they do!

In this image, the capillaries on the left-hand side contain a wetting liquid. Applying the gauge formula for the curved liquid surface we have $P_a-P_l=\frac{2\sigma}{R}^{*}.$ Where $\sigma$ is the ...
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What is this liquid flow behavior called?

Every morning, when I take a clean, dry metal tumbler and fill it with hot coffee, the first sip is always different than the rest that follow. The first sip requires some coaxing, for me to tip the ...
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Capillary action in presence of weight and atmospheric pressure

In capillary action the water for example rises in a small-diameter-glass tube due to that the cohesive and adhesive forces are larger than gravity and fall if they were less than gravity .The ...
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In a capillary tube do adhesive forces only act upwards at the surface of the liquid?

I was reading the derivation of Jurin's Law on Wikipedia (https://en.wikipedia.org/wiki/Jurin%27s_law) and the statement that the pressure variation along the height of the tube would be $P_{\text{int}...
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What would the meniscus look like in a beveled capillary tube?

I have a question about capillary action that I can't seem to find an answer to. Say I have a beveled capillary tube, the height of which is lower than what capillary action would take the water up to ...
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Capillary action, pressure at differents places

I figured out that I really have no intuition about pressure in capillary action. I understand the math, especially forces (tension force and gravitational force), but the pressure is foreign to me. ...
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Insufficient height of capillary and liquid still doesn't spill [duplicate]

This is the case of a insufficient capillary tube. The liquid can actually reach up to a height of >h ,but we have limited the height of the capillary tube and made it smaller than what actually ...
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Why is there a pressure difference of $h\rho g$ at the top of tube between inner and outer surface in capillary rise?

A glass capillary tube is of the shape of a truncated cone with an apex angle alpha so that it's two ends have cross sections of different radius. When dipped in water vertically, water rises to a ...
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Capillary action in conical capillary tube

Hi! I want to clear my concepts regarding surface tension . This approach works well in case of a cylindrical tube but fails when the tube is conical. Why so? I tried this question by balancing the ...
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Surface tension (capillary action)

Why we assume that meniscus that is formed when a capillary tube is immersed in a liquid is spherical (neglecting mass of the meniscus)? What will be the shape of the meniscus when mass is not ...
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Effect of temperature on capillary action

As a science teacher, I always explain kids about how water rises in a capillary tube: Capillary action occurs when the adhesion to the walls is stronger than the cohesive forces between the liquid ...
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Capillary action on capillary joints

There isn't much to say. In this question $B$ & $C$ are correct answers, and I can see how. However, I don't know how $D$'s validity could be determined. The solutions claimed that water will not ...
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How does a sponge absorb water?

I am studying for YIPT questions. I want to know what are the parameters that help sponge to absorb liquid ?
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Big confusion in surface tension

I am a high school student and I am very confused in the concept of surface tension and capillary rise phenomenon, my school level textbooks is very ambiguous about it they first tell you that the ...
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Which are the radii of curvature in the Laplace Pressure formula?

Laplace pressure is given by $$\Delta p=\gamma \left(\frac{1}{R}+\frac{1}{R'}\right)$$ where $R$ and $R'$ are the radii of the curvature of the surface. Using the following diagram There are at least ...
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Why isn't the capillary tube displaced downward by the column of water?

Water moves upward in a capillary tube due to intermolecular forces between water and the glass wall of the capillary tube. If those forces act on water pushing it up, why don't we see the opposite ...
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Surface tension and capillary rise intution

I am high school student I am very confused in "surface tension", My confusion is that: 1) In this image I have shown that, In some books the reason for this shape of meniscus is explained ...
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2 answers
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Law of conservation of energy and potential energy

I completely understand how this law goes and how energy is changed from one form to another. But there is something that I thought about, we all know how the potential energy works and when an object ...
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2 votes
1 answer
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Does capillary action work in moving bodies?

If I were to have a capillary tube on a moving body such as an ocean buoy, would it still be able to draw the liquid upwards? Or would the turbulence slow down or stop capillary action?
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Why can't capillary tubes overflow due to this reason? [duplicate]

It is known that raises to a certain height based on the parameters of surface tension, the radius of the tube, etc. Given by the formula $$h=\frac{2S\cos \theta}{\rho Rg}$$ When the capillary tube is ...
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Why do we consider only liquid-air surface forces in capillary rise?

Consider this diagram from wikipedia. Now the diagram clearly depicts forces due to three interfaces. But in the derivation of capillary rise, we only consider the force due to Surface Tension of the ...
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Laplace pressure

I'm quite confused with Laplace pressure. I know the formula is (at least considering a spherical surface) $\Delta P = P_{in}-P_{out} = \frac{4\sigma}{d}$. What exactly is the surface you have to ...
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Smaller droplets == smaller surface tension?

When applying soap liquid on the inner surface of swim goggles, the surface tension of the water decreases and small droplets of water on the surface won't form, therefore the fog won't form. In this ...
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What would happen if two liquids of different nature are mixed together?

I was studying surface tension the other day and this thought came to my mind. What would happen if say a liquid like mercury which has higher cohesive forces than adhesive ones(hence the convex ...
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Capillary rise of water in a capillary tube

While I was selfstudying capillary rise I came to a point thinking how the meniscus in both ends of a water drop in a capillary tube would appear if it were falling under gravity then I built my ...
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Why does the liquid column in a capillary tube exert pressure as its weight is already balanced by surface tension?

I read that the meniscus, due to surface tension, exerts an upward pull to the liquid column below it. The water rises to a height until the weight balances the pull. Now liquid exerts pressure ...
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3 answers
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Measurement of Surface Tension of a Liquid by Capillary Rise Method [closed]

The surface tension at the point of contact for water is inwards (as written in my book) so that would mean it vertical component is downwards but why is that vertical component considered upwards? I ...
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Angle of contact in a capillary tube?

Why the angle of contact of water and glass is 0. According to the capillary action why the angle of contact of water and glass is 0.
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How can a tree fill a coconut with water? [duplicate]

Water goes up in plants by cappilary action. So that should also explain water inside coconuts. My doubt relates to the easy experiment of transfering water from a filled glass to an empty one using ...
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2 votes
1 answer
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Why can water wicks act like siphons?

Take two empty cups (cup A and cup B) and fill cup A with water. Take a length of wet cloth and run it from the bottom of cup A to the bottom of cup B, while the cups are standing next to each other ...
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Mechanism behind capillary action

When we place a capillary tube in a beaker containing a liquid, why does the liquid level in the tube rise? Also, if it rises, won't there be a difference in the pressure at points A and B?( A is ...
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Pressure variation in a capillary tube

The following image shows capillary tubes placed in beakers containing water and mercury: We know that the rise or fall in the level of liquid in a capillary tube is given by Jurin's law: $$h=\frac{...
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Does capillary action affect the accuracy of mercury barometer?

We know that mercury barometers are used to measure the atmospheric pressure by determining the height of mercury in the vertical column. Further, we know that the level of mercury in a capillary tube ...
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Surface tension and Speed of capillary action

I have read that the height of meniscus in a capillary is directly proportionate to liquid-air surface tension. That left me wondering, is the speed at which capillary action occurs also ...
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How to avoid water tension in a hose?

I am doing a project in which I have to flow water between two containers, which are connected at the bottom by a 1/4" hose. Remarkably, the surface water tension is such that water does not flow ...
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Why does solder wick absorb solder?

Solder wick is basically just braided copper wire that absorbs molten tin solder in contact. But how does it work? The molten solder is very effectively sucked into the braids. The same effect is not ...
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How is it possible for tall trees to pull water to heights more than 10m?

Which force actually drives water so high up, since pure atmospheric pressure will only get you up to about 10 meters if you're using suction and a long straw and yet tallest trees are over 100 meters ...
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