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Environmental Lapse Rate
- actual change of temperature with altitude for the stationary atmosphere.
- the negative of the actual change of temperature with altitude of the stationary atmosphere at a specific time and specific location.
- the ICAO defines an international standard atmosphere (ISA) with a temperature lapse rate of 1.98 °C/1,000 ft from sea level to 11 km .
Dry Adiabatic Lapse Rate
- negative of the rate at which a rising parcel of dry or unsaturated air changes temperature with increasing height.
- Unsaturated air has less than 100% relative humidity; i.e. its temperature is higher than its dew point.
Saturated Adiabatic Lapse rate
- When the air is saturated with water vapour (at its dew point), the moist adiabatic lapse rate (MALR) or saturated adiabatic lapse rate (SALR) applies.
- Lapse Rate - Wikipedia