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- noun physics, meteorology An imaginary body of air to which may be assigned any or all of the basic
dynamicand thermodynamicproperties 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 uniformwithin it and so that its motions with respect to the surrounding atmosphere do not induce marked compensatorymovements. 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.
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