A film of ethanol at 20C has a surface tension of 22.3 mN/m and is maintained on
Question:
A film of ethanol at 20◦C has a surface tension of 22.3 mN/m and is maintained on a wire frame, as shown in Fig. P3.202. Consider the film with two surfaces as a control mass and find the work done when the wire is moved 10 mm to make the film 20 × 40 mm.
30 mm Wire frame -Ethanol 20 mm film FIGURE P3.202
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To find the work done when the wire is moved to make the film 20 x 40 mm we can u...View the full answer
Fundamentals Of Thermodynamics
ISBN: 9781118131992
8th Edition
Authors: Claus Borgnakke, Richard E. Sonntag
Related Video
The property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules. The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension. The molecules at the surface of a glass of water do not have other water molecules on all sides of them and consequently, they cohere more strongly to those directly associated with them (in this case, next to and below them, but not above). is not really true that a \\\"skin\\\" forms on the water surface; the stronger cohesion between the water molecules as opposed to the attraction of the water molecules to the air makes it more difficult to move an object through the surface than to move it when it is completely submersed
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