Studying the air layer over a solid object

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  • Thread starter hagopbul
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  • #1
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Summary:

studying thin film of gas mixture

Main Question or Discussion Point

Hello all :

i was wondering is it possible to study the air layer over a solid object at the interface ? using spectroscopic methods ? for example density ?
 

Answers and Replies

  • #2
jrmichler
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Short anwer: Yes.

Longer answer: Study for what? Velocity profile of moving air, temperature profile if the surface is different temperature, chemical profile if the surface is absorbing/emitting a gas (evaporating water?), plasma composition if the surface is really hot, pressure wave profile if the surface is vibrating, some combination of the above, what?
 
  • #3
sophiecentaur
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How thick is the interface layer of interest? Is there some sort of gradient of temperature or gas concentration?
AS @jrmichler says - we need to know more about this.
 
  • #4
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The others are quite right. We definitely need to know more about what you want to do. I think you could start your education with these terms for gases: infrared spectroscopy and bond vibrations, and Beer's law. You'll also need to know about the reflectivity or transmitivity as a function of frequency for the surface you are working with.
 
  • #5
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hello again this is some thing i was wondering about as a side project one day in the future , as a way to study the humidity of the soil (evaporating water?) , i cant concentrate on it now but just taking note for future or to pass it to some expert in the field if it is meaningful

i know we can use it for solid substrate , but what about soil with its different properties

thank you all
H.B.
 
  • #6
jrmichler
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If you want to study evaporation from soil, and especially if you intend to talk to experts in the field, first read (study would be better) this book by Brutsaert: https://www.amazon.com/dp/9027712476/?tag=pfamazon01-20. It is THE book on the subject.

Then follow that by reading this paper about the eddy covariance method of estimating evaporation: https://www.srs.fs.usda.gov/pubs/ja/ja_sun022.pdf.

Evaporation from open water is a little simpler. This paper by John Lenters et. al. is a good place to start: https://www.academia.edu/4981223/Effects_of_climate_variability_on_lake_evaporation_Results_from_a_long-term_energy_budget_study_of_Sparkling_Lake_northern_Wisconsin_USA.

And a lower cost method of measuring evaporation from open water: https://www.researchgate.net/publication/335029148_A_low-cost_hydrologic_observatory_for_monitoring_the_water_balance_of_small_lakes. I, of course, like this paper.
 

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