The atmosphere is said to be stable when the air parcel is pushed upwards a bit and continues to move upwards.
In general, if the ascending packet of air packets is lower than the surrounding environment, it tends to descend and return to its original function. This is because cold air is especially denser or heavier than hot air. This is called stable air. If the rising air mass is warmer than the surrounding environment, it will withstand an upward thrust.
When the temperature of the air parcel cools completely to the true dew point temperature, the relative humidity reliably reaches 100%. A similar rise and cooling cause Internet condensation to form clouds at the ambient dip rate.
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