air parcel

From Glossary of Meteorology
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An imaginary volume of air to which may be assigned any or all of the basic dynamic and thermodynamic properties of atmospheric air.
A parcel is large enough to contain a very great number of molecules, but small enough so that the properties assigned to it are approximately uniform within it and so that its motions with respect to the surrounding atmosphere do not induce marked compensatory movements. It cannot be given precise numerical definition, but a cubic foot of air might fit well into most contexts where air parcels are discussed, particularly those related to static stability. Any fluid parcel may be defined similarly.

parcela de aire

Es un volumen imaginario de aire al que se le puede asignar cualquiera de las propiedades dinámicas y termodinámicas básicas, o todas ellas, del aire atmosférico.

Una parcela es lo suficientemente grande como para contener un gran número de moléculas, aunque lo suficientemente pequeña como para que las propiedades que se le atribuyen sean aproximadamente uniformes dentro de ella y para que sus movimientos con respecto a la atmósfera circundante no induzcan movimientos compensatorios evidentes. No se puede dar una definición numérica precisa, pero un pie cúbico de aire podría encajar bien en la mayoría de los contextos donde se habla de parcelas de aire, especialmente con las que se relacionan con estabilidad estática. Se puede definir de manera similar a cualquier parcela de fluido.

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