•Vertical momentum equation
–vertical accelerations due to imbalance between downward directed gravitational force and upward directed pressure gradient force
•Stable- adiabatic parcel displaced from original altitude accelerated back towards original altitude
•Neutral- adiabatic parcel displaced from original altitude. continues to move at a constant speed
•Unstable- adiabatic parcel displaced from original altitude continues to accelerate away from original altitude
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