An Air Parcel  An invisible, imaginary, and infinitely elastic container  Usually a cubic meter in size (1 m 3 )  It is used to test the atmosphere  It does not actually occur in nature  Can be used to determine how a portion of the atmosphere evolves  Can be roughly shown with weather balloons  Shows atmospheric instability  Extremely useful when studying heat and energy exchange in the atmosphere voices.washingtonpost.com upload.wikimedia.org
{}