Studying the air layer over a solid object

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Discussion Overview

The discussion centers on the feasibility of studying the air layer over a solid object at the interface using spectroscopic methods, particularly in relation to parameters such as density, temperature, and chemical profiles. Participants explore various aspects of this inquiry, including potential applications and methodologies.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant questions the specific goals of the study, suggesting that various profiles (velocity, temperature, chemical, etc.) could be of interest depending on the context.
  • Another participant emphasizes the need to define the thickness of the interface layer and whether there are gradients in temperature or gas concentration.
  • A suggestion is made to familiarize oneself with terms related to gases, such as infrared spectroscopy and Beer's law, which may be relevant to the study.
  • A participant expresses interest in using this study as a side project to investigate soil humidity through evaporation, noting the different properties of soil compared to solid substrates.
  • Further resources are recommended for studying evaporation from soil and open water, including specific books and papers that could provide foundational knowledge and methodologies.

Areas of Agreement / Disagreement

Participants generally agree on the need for more clarity regarding the objectives of the study and the parameters of interest. However, there are multiple competing views on the specific methodologies and applications that could be pursued, leaving the discussion unresolved.

Contextual Notes

Limitations include the need for clearer definitions of the interface layer and the specific conditions under which the study would be conducted. The discussion also highlights the dependence on various spectroscopic methods and their applicability to different materials.

hagopbul
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TL;DR
studying thin film of gas mixture
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 ?
 
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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?
 
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.
 
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.
 
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 can't 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.
 
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/Ef...tudy_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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