| Parcels of air, or thermals, which are isolated from the surrounding atmosphere, cool at a predetermined rate known as the adiabatic lapse rate. |
| If the lapse rate is less than the moist adiabatic lapse rate, the atmosphere is absolutely stable. |
| The velocity cannot cross the sonic barrier in adiabatic flow through a conduit of constant cross section. |
| For unsaturated moist air the adiabatic lapse rate is almost the same as the dry adiabatic lapse rate. |
| A representative estimate of the saturation adiabatic lapse rate is 6 Celsius degrees per kilometer. |
| Entropy, according to the 2nd law, can indeed remain constant but only either in reversible adiabatic processes or in reversible cycles. |
