EMA4121_HW3_Solutions

What is the interfacial tension between the water and

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Unformatted text preview: e interfacial tension between the water and the oil? The silicone is highly viscous, so assume it behaves like a solid. For water, γlv=72.5 mJ/m2 Water droplet Silicone oil film, γsv=20 mJ/m2 ( ) 4. The pressure inside an air bubble in water is ___________(less than, equal to, or greater than) the hydrostatic pressure inside a droplet of water in air when both have the same diameter. Why? Less than; because the critical radius is measured from the water to the vapor, which would be . negative in this case. This results in a reduced saturation pressure according to See also the Laplace equation. 5. The surface tensions of solutions of sodium dodecyl sulfate (SDS) in 0.1 NaCl at 20°C are: SDS (mM) 2.0 1.0 0.5 0.2 0.1 0.04 0.02 0.01 γ (mJ/m2) 37.90 38.26 45.28 53.87 60.04 66.13 69.31 71.44 2 The surface tension of a 0.1 NaCl solu...
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This document was uploaded on 03/19/2014 for the course EMA 4121 at University of Florida.

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