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The dyne per centimetre is a unit traditionally used to measure surface tension. For example, the surface tension of distilled water is 71.99 dyn/cm at 25 °C (77 °F). [ 4 ] ( In SI units this is 71.99 × 10 −3 N/m or 71.99 mN/m .)
Surface tension is an important factor in the phenomenon of capillarity. Surface tension has the dimension of force per unit length, or of energy per unit area. [4] The two are equivalent, but when referring to energy per unit of area, it is common to use the term surface energy, which is a more general term in the sense that it applies also to ...
In physics, the Young–Laplace equation (/ l ə ˈ p l ɑː s /) is an algebraic equation that describes the capillary pressure difference sustained across the interface between two static fluids, such as water and air, due to the phenomenon of surface tension or wall tension, although use of the latter is only applicable if assuming that the wall is very thin.
In the equation, m 1 and σ 1 represent the mass and surface tension of the reference fluid and m 2 and σ 2 the mass and surface tension of the fluid of interest. If we take water as a reference fluid, = If the surface tension of water is known which is 72 dyne/cm, we can calculate the surface tension of the specific fluid from the equation.
Right: The reduction in flux passing through a surface can be visualized by reduction in F or dS equivalently (resolved into components, θ is angle to normal n). F•dS is the component of flux passing through the surface, multiplied by the area of the surface (see dot product). For this reason flux represents physically a flow per unit area.
At the meniscus interface, due to the surface tension, there is a pressure difference of =, where is the pressure on the convex side; and is known as Laplace pressure. If the tube has a circular section of radius r 0 {\displaystyle r_{0}} , and the meniscus has a spherical shape, the radius of curvature is r = r 0 / cos θ {\displaystyle r ...
However, a fluid also experiences pressure that is induced by surface tension, commonly referred to as the Young–Laplace pressure. [1] Surface tension originates from cohesive forces between molecules, and in the bulk of the fluid, molecules experience attractive forces from all directions. The surface of a fluid is curved because exposed ...
The surface of the liquid has the shape of a spherical cap, due to Laplace pressure S = γ SG − γ SL − γ LG {\displaystyle S\ =\gamma _{\text{SG}}-\gamma _{\text{SL}}-\gamma _{\text{LG}}} where γ SG is the solid-gas surface tension , γ SL is the solid-liquid surface tension and γ LG is the liquid-gas surface tension (measured for the ...