This article is rated Start-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||
|
Large parts of this article, on "Buoyancy" and "Applications" digress very far from the topic of this article: air parcels, which are small material elements retaining their identity as they move with the flow. Their use is far wider than suggested by the editor of this material (Darrenvc), and covers the whole field of fluid dynamics, not just a simplistic approach to buoyancy. I intent to remove this material, and rewrite the article as a general article on fluid parcels. -- Crowsnest ( talk) 18:22, 9 March 2009 (UTC)
I want to add support to the idea that the "air parcel" really is just a simple concept used in many other fluid-flow-related endevours. For example, it is referenced in the Lift(force) article in context meaning it to be a very small bit of air flowing around a wing creating lift. "Air Parcel" really shouldn't be the title of this meteorology article. Perhaps this article could be given another title and/or merged with something meteorology related. --
gummer85 —Preceding
undated comment added
09:38, 10 March 2009 (UTC).
It seems to me that an air parcel (or fluid parcel) is really just a way of discretizing a continuum. Discretizing a continuum is useful for:
1) Conceptualizing (grasping!) movement of the flow in the mind.
2) Numerical analysis of the flow.
However, when it comes down to it, a continuum is an approximation and an imperfect model. When we make the discrete steps (the "parcels" or the wee-little fixed control volumes) small to reduce error due to discretizing, the "continuum approximation errors" become larger. (Because molecules become large compared to parcels/CVs.)
Heck, now that I think about it, a fluid "parcel" isn't even a real thing! It's not physics! :-) Sure, it's used in the math that supports physics, and for conceptualizing (1 and 2 above), but it just ain't real. Actually, a fluid parcel is a merely a way of approximating a fluid continuum, which itself is an approximation for "more correct" molecular interactions.
Fluid parcel is just so trivial. Hmmm... maybe "air parcel" or "fluid parcel" could be written up in the context of "continuum" or "continuum approximation". Only a short paragraph or two if it has its own article. Maybe, as well, application to meteorology could be mentioned in that the especially large parcels used there are "interesting". Maybe the whole current article could also be kept and renamed "Air Parcels Applied To Weather Modeling" or something like that.
Gummer85 ( talk) 18:08, 10 March 2009 (UTC)
Neato! -- Gummer85 ( talk) 23:32, 10 March 2009 (UTC)