The generally prevalent temperature-altitude relationship in the lower atmosphere is known as the adiabatic lapse rate(ALR,绝热递降速率 adiabatic: no heat energy is either gained or lost by some defined volume of gas lapse: temperature decreases with increasing altitude If a given parcel of air, warmer than its surroundings, starts to rise in the atmosphere, and if it can be considered to do without exchanging heat energy with the neighboring air, it will expand and cool at the adiabatic lapse rate An approximate average ALR is-0.65 oC/100m or-3 oF/1000feet The alR, in simple terms is the rate at which the temperature of a volume of air will naturally tend to decrease as altitude increase, or increase as altitude decreasesThe generally prevalent temperature-altitude relationship in the lower atmosphere is known as the adiabatic lapse rate (ALR, 绝热递降速率). adiabatic: no heat energy is either gained or lost by some defined volume of gas lapse: temperature decreases with increasing altitude If a given parcel of air, warmer than its surroundings, starts to rise in the atmosphere, and if it can be considered to do without exchanging heat energy with the neighboring air, it will expand and cool at the adiabatic lapse rate. An approximate average ALR is -0.65 oC/100m or -3 oF/1000feet. The ALR, in simple terms, is the rate at which the temperature of a volume of air will naturally tend to decrease as altitude increase, or increase as altitude decreases