level of free convection
- The level at which a parcel of air lifted dry adiabatically becomes saturated. It would then rise moist adiabatically and being warmer than the surrounding atmosphere would continue to rise in a conditionally unstable atmosphere. The dry adiabatic lapse rate is the rate of decrease of temperature with the height of a parcel of dry air lifted adiabatically. It is equal to 3°C/5.4°F per 1000 ft (9.767°C/km). ELR is the environmental lapse rate (i.e., the actual rate of decrease of temperature in the atmosphere).If a dry mass of air is lifted from A to B adiabatically it will tend to come down from its position B to position A. However, if it becomes saturated at B and rises to C, it will continue to rise.
Aviation dictionary. 2014.
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