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Objectives. By the end of today you should be able to... ...describe different forming processes, when they might be used, and compare their production rates, costs and environmental impacts. ...calculate forming forces, predict part defects (tearing, wrinkling, dimensional inaccuracy), and propose. solutions.
Surface tension is defined as the energy required to increase the surface area of a liquid, or the force required to increase the length of a liquid surface by a given amount. This property results from the cohesive forces between molecules at the surface of a liquid, and it causes the surface of a liquid to behave like a stretched rubber membrane.
Sample problems based on Surface tension Problem 1. A wooden stick 2m long is floating on the surface of water. The surface tension of water 0.07 N/m. By putting soap solution on one side of the sticks the surface tension is reduced to 0.06 N/m. The net force on the stick will be (a ) 0.07 N (b ) 0.06 N (c ) 0.01 N (d ) 0.02 N
12 lut 2020 · Surface tension is a phenomenon in which the surface of a liquid, where the liquid is in contact with a gas, acts as a thin elastic sheet. This term is typically used only when the liquid surface is in contact with gas (such as the air).
Surface tension. At the interface between two materials physical properties change rapidly over distances comparable to the molecular separation scale. The transition layer is, from a macroscopic point of view, an infinitely thin sheet coinciding with the interface.
Cohesive forces between molecules cause the surface of a liquid to contract to the smallest possible surface area. This general effect is called surface tension. Molecules on the surface are pulled inward by cohesive forces, reducing the surface area.
The surface tension is due to the fact that a molecule on the surface of a liquid is acted upon by attractive forces from adjacent molecules towards one side only (see Fig.1). The resultant force acting on the molecule points into the liquid and is perpendicular to the surface.
