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All of these vehicles are functioning exactly like a waterski; they are impacting the motionless water and pushing it down, thereby being themselves pushed up. The only difference is what keeps them moving; a waterskier is pulled by a boat, the snowmobile is pushed by the ribs on the belt, and the ATV is being pushed (somewhat) by its wheel treads. But, the ...

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As the bubble rises it pushes the water above it out of the way, so we get a water flow created around the bubble. With a large bubble the flow velocities will be relatively high because a large bubble has to push aside a large volume of water. Water flowing around a bubble will pull it out of shape. the obvious simple example is a bubble in a shear flow, ...

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The bubble maintains a spherical shape, because of surface tension, which I am sure you are aware of. It does so , because it wants to store maximum volume of the fluid involved, using minimum surface area, which can be done using a spherical shape. Thus, the layer of the bubble acts like a stretched membrane. When the pressure inside the bubble, for ...

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The units of surface tension are $[N/m]=[J/m^2]$ which means surface tension can be interpreted as the energy cost of creating additional surface area. Imagine any shape in equilibrium; increasing its surface area will require an energy input to overcome surface tensile forces before it reaches a new equilibrium. Now per volume the surface area of a cube of ...

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$\mathbf{Geometrical \ approach}:$ Each point on the surface of a sphere is at an equal distance (equal to radius) from the center this results in the minimum surface area for a given volume. This can be proved analytically by comparing the surface area of a sphere with that of any other geometrical shape for a given volume. For example, let's compare ...

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The reason a drop of water takes spherical shape is surface tension of the water, that tends to minimize the surface area of the drop.as this minimizes the potential energy and for given vloume sphere has minimum surface area among all possible configuration.

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HINTS: $\mathbf{\text{Viscosity}}$: it arises from cohesive forces between the (similar) molecules & the momentum exchange between the adjacent/consecutive layers of a fluid. $\mathbf{\text{Surface tension}}$: it arises only from the cohesive forces between the similar molecules at the free surface & the molecules inside of a fluid

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Reduction of surface tension of water can be done in several ways> A few of them are as follows: Surfactants are compounds that lower the surface tension of a liquid like water, the interfacial tension between two liquids, or that between a liquid and a solid. Surfactants may act as detergents, wetting agents, emulsifiers, foaming agents, and dispersants. ...

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Surface tension is a quite confusing subject, especially viewed from a purely mechanical point of view. It appears whenever you have an interface between a condensed phase say $A$ and another immiscible fluid phase $B$. Thus the first thing to note is that surface tension has always to do with an interface. The surface tension coefficient often denoted ...

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It's not the rapid decrease in pressure, but the associated turbulence. There's a pinch point in the valve that the beer squeezes past, and in the process undergoes lots of turbulence. Like shaking a soda can, this causes the $CO_2$ to come out of solution as froth. Adding the long hose adds drag to the flowing beer, slowing its motion through that pinch ...

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The vessel do matters. But you can only loose. If you look the capillarity from wikipedia, you can notice that the contact angle has an influence in the height of a liquid column. But the equation reveals you, that the influence is COS(contact angle), and it's a plain multiplier. Cos (0) is the maximum. You will have an effect if you use various materials; ...

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